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root/sound/pci/trident/trident_main.c

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DEFINITIONS

This source file includes following definitions.
  1. snd_trident_print_voice_regs
  2. snd_trident_codec_read
  3. snd_trident_codec_write
  4. snd_trident_enable_eso
  5. snd_trident_disable_eso
  6. snd_trident_start_voice
  7. snd_trident_stop_voice
  8. snd_trident_allocate_pcm_channel
  9. snd_trident_free_pcm_channel
  10. snd_trident_allocate_synth_channel
  11. snd_trident_free_synth_channel
  12. snd_trident_write_voice_regs
  13. snd_trident_write_cso_reg
  14. snd_trident_write_eso_reg
  15. snd_trident_write_vol_reg
  16. snd_trident_write_pan_reg
  17. snd_trident_write_rvol_reg
  18. snd_trident_write_cvol_reg
  19. snd_trident_convert_rate
  20. snd_trident_convert_adc_rate
  21. snd_trident_spurious_threshold
  22. snd_trident_control_mode
  23. snd_trident_ioctl
  24. snd_trident_allocate_pcm_mem
  25. snd_trident_allocate_evoice
  26. snd_trident_hw_params
  27. snd_trident_hw_free
  28. snd_trident_playback_prepare
  29. snd_trident_capture_hw_params
  30. snd_trident_capture_prepare
  31. snd_trident_si7018_capture_hw_params
  32. snd_trident_si7018_capture_hw_free
  33. snd_trident_si7018_capture_prepare
  34. snd_trident_foldback_prepare
  35. snd_trident_spdif_hw_params
  36. snd_trident_spdif_prepare
  37. snd_trident_trigger
  38. snd_trident_playback_pointer
  39. snd_trident_capture_pointer
  40. snd_trident_spdif_pointer
  41. snd_trident_pcm_free_substream
  42. snd_trident_playback_open
  43. snd_trident_playback_close
  44. snd_trident_spdif_open
  45. snd_trident_spdif_close
  46. snd_trident_capture_open
  47. snd_trident_capture_close
  48. snd_trident_foldback_open
  49. snd_trident_foldback_close
  50. snd_trident_pcm
  51. snd_trident_foldback_pcm
  52. snd_trident_spdif_pcm
  53. snd_trident_spdif_control_get
  54. snd_trident_spdif_control_put
  55. snd_trident_spdif_default_info
  56. snd_trident_spdif_default_get
  57. snd_trident_spdif_default_put
  58. snd_trident_spdif_mask_info
  59. snd_trident_spdif_mask_get
  60. snd_trident_spdif_stream_info
  61. snd_trident_spdif_stream_get
  62. snd_trident_spdif_stream_put
  63. snd_trident_ac97_control_get
  64. snd_trident_ac97_control_put
  65. snd_trident_vol_control_info
  66. snd_trident_vol_control_get
  67. snd_trident_vol_control_put
  68. snd_trident_pcm_vol_control_info
  69. snd_trident_pcm_vol_control_get
  70. snd_trident_pcm_vol_control_put
  71. snd_trident_pcm_pan_control_info
  72. snd_trident_pcm_pan_control_get
  73. snd_trident_pcm_pan_control_put
  74. snd_trident_pcm_rvol_control_info
  75. snd_trident_pcm_rvol_control_get
  76. snd_trident_pcm_rvol_control_put
  77. snd_trident_pcm_cvol_control_info
  78. snd_trident_pcm_cvol_control_get
  79. snd_trident_pcm_cvol_control_put
  80. snd_trident_notify_pcm_change1
  81. snd_trident_notify_pcm_change
  82. snd_trident_pcm_mixer_build
  83. snd_trident_pcm_mixer_free
  84. snd_trident_mixer
  85. snd_trident_gameport_read
  86. snd_trident_gameport_trigger
  87. snd_trident_gameport_cooked_read
  88. snd_trident_gameport_open
  89. snd_trident_create_gameport
  90. snd_trident_free_gameport
  91. snd_trident_create_gameport
  92. snd_trident_free_gameport
  93. do_delay
  94. snd_trident_sis_reset
  95. snd_trident_proc_read
  96. snd_trident_proc_init
  97. snd_trident_dev_free
  98. snd_trident_tlb_alloc
  99. snd_trident_stop_all_voices
  100. snd_trident_4d_dx_init
  101. snd_trident_4d_nx_init
  102. snd_trident_sis_init
  103. snd_trident_create
  104. snd_trident_free
  105. snd_trident_interrupt
  106. snd_trident_alloc_voice
  107. snd_trident_free_voice
  108. snd_trident_clear_voices
  109. snd_trident_suspend
  110. snd_trident_resume

/*
 *  Maintained by Jaroslav Kysela <perex@perex.cz>
 *  Originated by audio@tridentmicro.com
 *  Fri Feb 19 15:55:28 MST 1999
 *  Routines for control of Trident 4DWave (DX and NX) chip
 *
 *  BUGS:
 *
 *  TODO:
 *    ---
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 *
 *  SiS7018 S/PDIF support by Thomas Winischhofer <thomas@winischhofer.net>
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/gameport.h>
#include <linux/dma-mapping.h>

#include <sound/core.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include <sound/trident.h>
#include <sound/asoundef.h>

#include <asm/io.h>

static int snd_trident_pcm_mixer_build(struct snd_trident *trident,
                                       struct snd_trident_voice * voice,
                                       struct snd_pcm_substream *substream);
static int snd_trident_pcm_mixer_free(struct snd_trident *trident,
                                      struct snd_trident_voice * voice,
                                      struct snd_pcm_substream *substream);
static irqreturn_t snd_trident_interrupt(int irq, void *dev_id);
static int snd_trident_sis_reset(struct snd_trident *trident);

static void snd_trident_clear_voices(struct snd_trident * trident,
                                     unsigned short v_min, unsigned short v_max);
static int snd_trident_free(struct snd_trident *trident);

/*
 *  common I/O routines
 */


#if 0
static void snd_trident_print_voice_regs(struct snd_trident *trident, int voice)
{
        unsigned int val, tmp;

        printk("Trident voice %i:\n", voice);
        outb(voice, TRID_REG(trident, T4D_LFO_GC_CIR));
        val = inl(TRID_REG(trident, CH_LBA));
        printk("LBA: 0x%x\n", val);
        val = inl(TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC));
        printk("GVSel: %i\n", val >> 31);
        printk("Pan: 0x%x\n", (val >> 24) & 0x7f);
        printk("Vol: 0x%x\n", (val >> 16) & 0xff);
        printk("CTRL: 0x%x\n", (val >> 12) & 0x0f);
        printk("EC: 0x%x\n", val & 0x0fff);
        if (trident->device != TRIDENT_DEVICE_ID_NX) {
                val = inl(TRID_REG(trident, CH_DX_CSO_ALPHA_FMS));
                printk("CSO: 0x%x\n", val >> 16);
                printk("Alpha: 0x%x\n", (val >> 4) & 0x0fff);
                printk("FMS: 0x%x\n", val & 0x0f);
                val = inl(TRID_REG(trident, CH_DX_ESO_DELTA));
                printk("ESO: 0x%x\n", val >> 16);
                printk("Delta: 0x%x\n", val & 0xffff);
                val = inl(TRID_REG(trident, CH_DX_FMC_RVOL_CVOL));
        } else {                // TRIDENT_DEVICE_ID_NX
                val = inl(TRID_REG(trident, CH_NX_DELTA_CSO));
                tmp = (val >> 24) & 0xff;
                printk("CSO: 0x%x\n", val & 0x00ffffff);
                val = inl(TRID_REG(trident, CH_NX_DELTA_ESO));
                tmp |= (val >> 16) & 0xff00;
                printk("Delta: 0x%x\n", tmp);
                printk("ESO: 0x%x\n", val & 0x00ffffff);
                val = inl(TRID_REG(trident, CH_NX_ALPHA_FMS_FMC_RVOL_CVOL));
                printk("Alpha: 0x%x\n", val >> 20);
                printk("FMS: 0x%x\n", (val >> 16) & 0x0f);
        }
        printk("FMC: 0x%x\n", (val >> 14) & 3);
        printk("RVol: 0x%x\n", (val >> 7) & 0x7f);
        printk("CVol: 0x%x\n", val & 0x7f);
}
#endif

/*---------------------------------------------------------------------------
   unsigned short snd_trident_codec_read(struct snd_ac97 *ac97, unsigned short reg)
  
   Description: This routine will do all of the reading from the external
                CODEC (AC97).
  
   Parameters:  ac97 - ac97 codec structure
                reg - CODEC register index, from AC97 Hal.
 
   returns:     16 bit value read from the AC97.
  
  ---------------------------------------------------------------------------*/
static unsigned short snd_trident_codec_read(struct snd_ac97 *ac97, unsigned short reg)
{
        unsigned int data = 0, treg;
        unsigned short count = 0xffff;
        unsigned long flags;
        struct snd_trident *trident = ac97->private_data;

        spin_lock_irqsave(&trident->reg_lock, flags);
        if (trident->device == TRIDENT_DEVICE_ID_DX) {
                data = (DX_AC97_BUSY_READ | (reg & 0x000000ff));
                outl(data, TRID_REG(trident, DX_ACR1_AC97_R));
                do {
                        data = inl(TRID_REG(trident, DX_ACR1_AC97_R));
                        if ((data & DX_AC97_BUSY_READ) == 0)
                                break;
                } while (--count);
        } else if (trident->device == TRIDENT_DEVICE_ID_NX) {
                data = (NX_AC97_BUSY_READ | (reg & 0x000000ff));
                treg = ac97->num == 0 ? NX_ACR2_AC97_R_PRIMARY : NX_ACR3_AC97_R_SECONDARY;
                outl(data, TRID_REG(trident, treg));
                do {
                        data = inl(TRID_REG(trident, treg));
                        if ((data & 0x00000C00) == 0)
                                break;
                } while (--count);
        } else if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                data = SI_AC97_BUSY_READ | SI_AC97_AUDIO_BUSY | (reg & 0x000000ff);
                if (ac97->num == 1)
                        data |= SI_AC97_SECONDARY;
                outl(data, TRID_REG(trident, SI_AC97_READ));
                do {
                        data = inl(TRID_REG(trident, SI_AC97_READ));
                        if ((data & (SI_AC97_BUSY_READ)) == 0)
                                break;
                } while (--count);
        }

        if (count == 0 && !trident->ac97_detect) {
                snd_printk(KERN_ERR "ac97 codec read TIMEOUT [0x%x/0x%x]!!!\n",
                           reg, data);
                data = 0;
        }

        spin_unlock_irqrestore(&trident->reg_lock, flags);
        return ((unsigned short) (data >> 16));
}

/*---------------------------------------------------------------------------
   void snd_trident_codec_write(struct snd_ac97 *ac97, unsigned short reg,
   unsigned short wdata)
  
   Description: This routine will do all of the writing to the external
                CODEC (AC97).
  
   Parameters:  ac97 - ac97 codec structure
                reg - CODEC register index, from AC97 Hal.
                data  - Lower 16 bits are the data to write to CODEC.
  
   returns:     TRUE if everything went ok, else FALSE.
  
  ---------------------------------------------------------------------------*/
static void snd_trident_codec_write(struct snd_ac97 *ac97, unsigned short reg,
                                    unsigned short wdata)
{
        unsigned int address, data;
        unsigned short count = 0xffff;
        unsigned long flags;
        struct snd_trident *trident = ac97->private_data;

        data = ((unsigned long) wdata) << 16;

        spin_lock_irqsave(&trident->reg_lock, flags);
        if (trident->device == TRIDENT_DEVICE_ID_DX) {
                address = DX_ACR0_AC97_W;

                /* read AC-97 write register status */
                do {
                        if ((inw(TRID_REG(trident, address)) & DX_AC97_BUSY_WRITE) == 0)
                                break;
                } while (--count);

                data |= (DX_AC97_BUSY_WRITE | (reg & 0x000000ff));
        } else if (trident->device == TRIDENT_DEVICE_ID_NX) {
                address = NX_ACR1_AC97_W;

                /* read AC-97 write register status */
                do {
                        if ((inw(TRID_REG(trident, address)) & NX_AC97_BUSY_WRITE) == 0)
                                break;
                } while (--count);

                data |= (NX_AC97_BUSY_WRITE | (ac97->num << 8) | (reg & 0x000000ff));
        } else if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                address = SI_AC97_WRITE;

                /* read AC-97 write register status */
                do {
                        if ((inw(TRID_REG(trident, address)) & (SI_AC97_BUSY_WRITE)) == 0)
                                break;
                } while (--count);

                data |= SI_AC97_BUSY_WRITE | SI_AC97_AUDIO_BUSY | (reg & 0x000000ff);
                if (ac97->num == 1)
                        data |= SI_AC97_SECONDARY;
        } else {
                address = 0;    /* keep GCC happy */
                count = 0;      /* return */
        }

        if (count == 0) {
                spin_unlock_irqrestore(&trident->reg_lock, flags);
                return;
        }
        outl(data, TRID_REG(trident, address));
        spin_unlock_irqrestore(&trident->reg_lock, flags);
}

/*---------------------------------------------------------------------------
   void snd_trident_enable_eso(struct snd_trident *trident)
  
   Description: This routine will enable end of loop interrupts.
                End of loop interrupts will occur when a running
                channel reaches ESO.
                Also enables middle of loop interrupts.
  
   Parameters:  trident - pointer to target device class for 4DWave.
  
  ---------------------------------------------------------------------------*/

static void snd_trident_enable_eso(struct snd_trident * trident)
{
        unsigned int val;

        val = inl(TRID_REG(trident, T4D_LFO_GC_CIR));
        val |= ENDLP_IE;
        val |= MIDLP_IE;
        if (trident->device == TRIDENT_DEVICE_ID_SI7018)
                val |= BANK_B_EN;
        outl(val, TRID_REG(trident, T4D_LFO_GC_CIR));
}

/*---------------------------------------------------------------------------
   void snd_trident_disable_eso(struct snd_trident *trident)
  
   Description: This routine will disable end of loop interrupts.
                End of loop interrupts will occur when a running
                channel reaches ESO.
                Also disables middle of loop interrupts.
  
   Parameters:  
                trident - pointer to target device class for 4DWave.
  
   returns:     TRUE if everything went ok, else FALSE.
  
  ---------------------------------------------------------------------------*/

static void snd_trident_disable_eso(struct snd_trident * trident)
{
        unsigned int tmp;

        tmp = inl(TRID_REG(trident, T4D_LFO_GC_CIR));
        tmp &= ~ENDLP_IE;
        tmp &= ~MIDLP_IE;
        outl(tmp, TRID_REG(trident, T4D_LFO_GC_CIR));
}

/*---------------------------------------------------------------------------
   void snd_trident_start_voice(struct snd_trident * trident, unsigned int voice)

    Description: Start a voice, any channel 0 thru 63.
                 This routine automatically handles the fact that there are
                 more than 32 channels available.

    Parameters : voice - Voice number 0 thru n.
                 trident - pointer to target device class for 4DWave.

    Return Value: None.

  ---------------------------------------------------------------------------*/

void snd_trident_start_voice(struct snd_trident * trident, unsigned int voice)
{
        unsigned int mask = 1 << (voice & 0x1f);
        unsigned int reg = (voice & 0x20) ? T4D_START_B : T4D_START_A;

        outl(mask, TRID_REG(trident, reg));
}

EXPORT_SYMBOL(snd_trident_start_voice);

/*---------------------------------------------------------------------------
   void snd_trident_stop_voice(struct snd_trident * trident, unsigned int voice)

    Description: Stop a voice, any channel 0 thru 63.
                 This routine automatically handles the fact that there are
                 more than 32 channels available.

    Parameters : voice - Voice number 0 thru n.
                 trident - pointer to target device class for 4DWave.

    Return Value: None.

  ---------------------------------------------------------------------------*/

void snd_trident_stop_voice(struct snd_trident * trident, unsigned int voice)
{
        unsigned int mask = 1 << (voice & 0x1f);
        unsigned int reg = (voice & 0x20) ? T4D_STOP_B : T4D_STOP_A;

        outl(mask, TRID_REG(trident, reg));
}

EXPORT_SYMBOL(snd_trident_stop_voice);

/*---------------------------------------------------------------------------
    int snd_trident_allocate_pcm_channel(struct snd_trident *trident)
  
    Description: Allocate hardware channel in Bank B (32-63).
  
    Parameters :  trident - pointer to target device class for 4DWave.
  
    Return Value: hardware channel - 32-63 or -1 when no channel is available
  
  ---------------------------------------------------------------------------*/

static int snd_trident_allocate_pcm_channel(struct snd_trident * trident)
{
        int idx;

        if (trident->ChanPCMcnt >= trident->ChanPCM)
                return -1;
        for (idx = 31; idx >= 0; idx--) {
                if (!(trident->ChanMap[T4D_BANK_B] & (1 << idx))) {
                        trident->ChanMap[T4D_BANK_B] |= 1 << idx;
                        trident->ChanPCMcnt++;
                        return idx + 32;
                }
        }
        return -1;
}

/*---------------------------------------------------------------------------
    void snd_trident_free_pcm_channel(int channel)
  
    Description: Free hardware channel in Bank B (32-63)
  
    Parameters :  trident - pointer to target device class for 4DWave.
                  channel - hardware channel number 0-63
  
    Return Value: none
  
  ---------------------------------------------------------------------------*/

static void snd_trident_free_pcm_channel(struct snd_trident *trident, int channel)
{
        if (channel < 32 || channel > 63)
                return;
        channel &= 0x1f;
        if (trident->ChanMap[T4D_BANK_B] & (1 << channel)) {
                trident->ChanMap[T4D_BANK_B] &= ~(1 << channel);
                trident->ChanPCMcnt--;
        }
}

/*---------------------------------------------------------------------------
    unsigned int snd_trident_allocate_synth_channel(void)
  
    Description: Allocate hardware channel in Bank A (0-31).
  
    Parameters :  trident - pointer to target device class for 4DWave.
  
    Return Value: hardware channel - 0-31 or -1 when no channel is available
  
  ---------------------------------------------------------------------------*/

static int snd_trident_allocate_synth_channel(struct snd_trident * trident)
{
        int idx;

        for (idx = 31; idx >= 0; idx--) {
                if (!(trident->ChanMap[T4D_BANK_A] & (1 << idx))) {
                        trident->ChanMap[T4D_BANK_A] |= 1 << idx;
                        trident->synth.ChanSynthCount++;
                        return idx;
                }
        }
        return -1;
}

/*---------------------------------------------------------------------------
    void snd_trident_free_synth_channel( int channel )
  
    Description: Free hardware channel in Bank B (0-31).
  
    Parameters :  trident - pointer to target device class for 4DWave.
                  channel - hardware channel number 0-63
  
    Return Value: none
  
  ---------------------------------------------------------------------------*/

static void snd_trident_free_synth_channel(struct snd_trident *trident, int channel)
{
        if (channel < 0 || channel > 31)
                return;
        channel &= 0x1f;
        if (trident->ChanMap[T4D_BANK_A] & (1 << channel)) {
                trident->ChanMap[T4D_BANK_A] &= ~(1 << channel);
                trident->synth.ChanSynthCount--;
        }
}

/*---------------------------------------------------------------------------
   snd_trident_write_voice_regs
  
   Description: This routine will complete and write the 5 hardware channel
                registers to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                Each register field.
  
  ---------------------------------------------------------------------------*/

void snd_trident_write_voice_regs(struct snd_trident * trident,
                                  struct snd_trident_voice * voice)
{
        unsigned int FmcRvolCvol;
        unsigned int regs[5];

        regs[1] = voice->LBA;
        regs[4] = (voice->GVSel << 31) |
                  ((voice->Pan & 0x0000007f) << 24) |
                  ((voice->CTRL & 0x0000000f) << 12);
        FmcRvolCvol = ((voice->FMC & 3) << 14) |
                      ((voice->RVol & 0x7f) << 7) |
                      (voice->CVol & 0x7f);

        switch (trident->device) {
        case TRIDENT_DEVICE_ID_SI7018:
                regs[4] |= voice->number > 31 ?
                                (voice->Vol & 0x000003ff) :
                                ((voice->Vol & 0x00003fc) << (16-2)) |
                                (voice->EC & 0x00000fff);
                regs[0] = (voice->CSO << 16) | ((voice->Alpha & 0x00000fff) << 4) |
                        (voice->FMS & 0x0000000f);
                regs[2] = (voice->ESO << 16) | (voice->Delta & 0x0ffff);
                regs[3] = (voice->Attribute << 16) | FmcRvolCvol;
                break;
        case TRIDENT_DEVICE_ID_DX:
                regs[4] |= ((voice->Vol & 0x000003fc) << (16-2)) |
                           (voice->EC & 0x00000fff);
                regs[0] = (voice->CSO << 16) | ((voice->Alpha & 0x00000fff) << 4) |
                        (voice->FMS & 0x0000000f);
                regs[2] = (voice->ESO << 16) | (voice->Delta & 0x0ffff);
                regs[3] = FmcRvolCvol;
                break;
        case TRIDENT_DEVICE_ID_NX:
                regs[4] |= ((voice->Vol & 0x000003fc) << (16-2)) |
                           (voice->EC & 0x00000fff);
                regs[0] = (voice->Delta << 24) | (voice->CSO & 0x00ffffff);
                regs[2] = ((voice->Delta << 16) & 0xff000000) |
                        (voice->ESO & 0x00ffffff);
                regs[3] = (voice->Alpha << 20) |
                        ((voice->FMS & 0x0000000f) << 16) | FmcRvolCvol;
                break;
        default:
                snd_BUG();
                return;
        }

        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
        outl(regs[0], TRID_REG(trident, CH_START + 0));
        outl(regs[1], TRID_REG(trident, CH_START + 4));
        outl(regs[2], TRID_REG(trident, CH_START + 8));
        outl(regs[3], TRID_REG(trident, CH_START + 12));
        outl(regs[4], TRID_REG(trident, CH_START + 16));

#if 0
        printk("written %i channel:\n", voice->number);
        printk("  regs[0] = 0x%x/0x%x\n", regs[0], inl(TRID_REG(trident, CH_START + 0)));
        printk("  regs[1] = 0x%x/0x%x\n", regs[1], inl(TRID_REG(trident, CH_START + 4)));
        printk("  regs[2] = 0x%x/0x%x\n", regs[2], inl(TRID_REG(trident, CH_START + 8)));
        printk("  regs[3] = 0x%x/0x%x\n", regs[3], inl(TRID_REG(trident, CH_START + 12)));
        printk("  regs[4] = 0x%x/0x%x\n", regs[4], inl(TRID_REG(trident, CH_START + 16)));
#endif
}

EXPORT_SYMBOL(snd_trident_write_voice_regs);

/*---------------------------------------------------------------------------
   snd_trident_write_cso_reg
  
   Description: This routine will write the new CSO offset
                register to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                CSO - new CSO value
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_cso_reg(struct snd_trident * trident,
                                      struct snd_trident_voice * voice,
                                      unsigned int CSO)
{
        voice->CSO = CSO;
        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
        if (trident->device != TRIDENT_DEVICE_ID_NX) {
                outw(voice->CSO, TRID_REG(trident, CH_DX_CSO_ALPHA_FMS) + 2);
        } else {
                outl((voice->Delta << 24) |
                     (voice->CSO & 0x00ffffff), TRID_REG(trident, CH_NX_DELTA_CSO));
        }
}

/*---------------------------------------------------------------------------
   snd_trident_write_eso_reg
  
   Description: This routine will write the new ESO offset
                register to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                ESO - new ESO value
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_eso_reg(struct snd_trident * trident,
                                      struct snd_trident_voice * voice,
                                      unsigned int ESO)
{
        voice->ESO = ESO;
        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
        if (trident->device != TRIDENT_DEVICE_ID_NX) {
                outw(voice->ESO, TRID_REG(trident, CH_DX_ESO_DELTA) + 2);
        } else {
                outl(((voice->Delta << 16) & 0xff000000) | (voice->ESO & 0x00ffffff),
                     TRID_REG(trident, CH_NX_DELTA_ESO));
        }
}

/*---------------------------------------------------------------------------
   snd_trident_write_vol_reg
  
   Description: This routine will write the new voice volume
                register to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                Vol - new voice volume
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_vol_reg(struct snd_trident * trident,
                                      struct snd_trident_voice * voice,
                                      unsigned int Vol)
{
        voice->Vol = Vol;
        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
        switch (trident->device) {
        case TRIDENT_DEVICE_ID_DX:
        case TRIDENT_DEVICE_ID_NX:
                outb(voice->Vol >> 2, TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC + 2));
                break;
        case TRIDENT_DEVICE_ID_SI7018:
                // printk("voice->Vol = 0x%x\n", voice->Vol);
                outw((voice->CTRL << 12) | voice->Vol,
                     TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC));
                break;
        }
}

/*---------------------------------------------------------------------------
   snd_trident_write_pan_reg
  
   Description: This routine will write the new voice pan
                register to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                Pan - new pan value
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_pan_reg(struct snd_trident * trident,
                                      struct snd_trident_voice * voice,
                                      unsigned int Pan)
{
        voice->Pan = Pan;
        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
        outb(((voice->GVSel & 0x01) << 7) | (voice->Pan & 0x7f),
             TRID_REG(trident, CH_GVSEL_PAN_VOL_CTRL_EC + 3));
}

/*---------------------------------------------------------------------------
   snd_trident_write_rvol_reg
  
   Description: This routine will write the new reverb volume
                register to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                RVol - new reverb volume
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_rvol_reg(struct snd_trident * trident,
                                       struct snd_trident_voice * voice,
                                       unsigned int RVol)
{
        voice->RVol = RVol;
        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
        outw(((voice->FMC & 0x0003) << 14) | ((voice->RVol & 0x007f) << 7) |
             (voice->CVol & 0x007f),
             TRID_REG(trident, trident->device == TRIDENT_DEVICE_ID_NX ?
                      CH_NX_ALPHA_FMS_FMC_RVOL_CVOL : CH_DX_FMC_RVOL_CVOL));
}

/*---------------------------------------------------------------------------
   snd_trident_write_cvol_reg
  
   Description: This routine will write the new chorus volume
                register to hardware.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                voice - synthesizer voice structure
                CVol - new chorus volume
  
  ---------------------------------------------------------------------------*/

static void snd_trident_write_cvol_reg(struct snd_trident * trident,
                                       struct snd_trident_voice * voice,
                                       unsigned int CVol)
{
        voice->CVol = CVol;
        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));
        outw(((voice->FMC & 0x0003) << 14) | ((voice->RVol & 0x007f) << 7) |
             (voice->CVol & 0x007f),
             TRID_REG(trident, trident->device == TRIDENT_DEVICE_ID_NX ?
                      CH_NX_ALPHA_FMS_FMC_RVOL_CVOL : CH_DX_FMC_RVOL_CVOL));
}

/*---------------------------------------------------------------------------
   snd_trident_convert_rate

   Description: This routine converts rate in HZ to hardware delta value.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                rate - Real or Virtual channel number.
  
   Returns:     Delta value.
  
  ---------------------------------------------------------------------------*/
static unsigned int snd_trident_convert_rate(unsigned int rate)
{
        unsigned int delta;

        // We special case 44100 and 8000 since rounding with the equation
        // does not give us an accurate enough value. For 11025 and 22050
        // the equation gives us the best answer. All other frequencies will
        // also use the equation. JDW
        if (rate == 44100)
                delta = 0xeb3;
        else if (rate == 8000)
                delta = 0x2ab;
        else if (rate == 48000)
                delta = 0x1000;
        else
                delta = (((rate << 12) + 24000) / 48000) & 0x0000ffff;
        return delta;
}

/*---------------------------------------------------------------------------
   snd_trident_convert_adc_rate

   Description: This routine converts rate in HZ to hardware delta value.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                rate - Real or Virtual channel number.
  
   Returns:     Delta value.
  
  ---------------------------------------------------------------------------*/
static unsigned int snd_trident_convert_adc_rate(unsigned int rate)
{
        unsigned int delta;

        // We special case 44100 and 8000 since rounding with the equation
        // does not give us an accurate enough value. For 11025 and 22050
        // the equation gives us the best answer. All other frequencies will
        // also use the equation. JDW
        if (rate == 44100)
                delta = 0x116a;
        else if (rate == 8000)
                delta = 0x6000;
        else if (rate == 48000)
                delta = 0x1000;
        else
                delta = ((48000 << 12) / rate) & 0x0000ffff;
        return delta;
}

/*---------------------------------------------------------------------------
   snd_trident_spurious_threshold

   Description: This routine converts rate in HZ to spurious threshold.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                rate - Real or Virtual channel number.
  
   Returns:     Delta value.
  
  ---------------------------------------------------------------------------*/
static unsigned int snd_trident_spurious_threshold(unsigned int rate,
                                                   unsigned int period_size)
{
        unsigned int res = (rate * period_size) / 48000;
        if (res < 64)
                res = res / 2;
        else
                res -= 32;
        return res;
}

/*---------------------------------------------------------------------------
   snd_trident_control_mode

   Description: This routine returns a control mode for a PCM channel.
  
   Parameters:  trident - pointer to target device class for 4DWave.
                substream  - PCM substream
  
   Returns:     Control value.
  
  ---------------------------------------------------------------------------*/
static unsigned int snd_trident_control_mode(struct snd_pcm_substream *substream)
{
        unsigned int CTRL;
        struct snd_pcm_runtime *runtime = substream->runtime;

        /* set ctrl mode
           CTRL default: 8-bit (unsigned) mono, loop mode enabled
         */
        CTRL = 0x00000001;
        if (snd_pcm_format_width(runtime->format) == 16)
                CTRL |= 0x00000008;     // 16-bit data
        if (snd_pcm_format_signed(runtime->format))
                CTRL |= 0x00000002;     // signed data
        if (runtime->channels > 1)
                CTRL |= 0x00000004;     // stereo data
        return CTRL;
}

/*
 *  PCM part
 */

/*---------------------------------------------------------------------------
   snd_trident_ioctl
  
   Description: Device I/O control handler for playback/capture parameters.
  
   Parameters:   substream  - PCM substream class
                cmd     - what ioctl message to process
                arg     - additional message infoarg     
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_ioctl(struct snd_pcm_substream *substream,
                             unsigned int cmd,
                             void *arg)
{
        /* FIXME: it seems that with small periods the behaviour of
                  trident hardware is unpredictable and interrupt generator
                  is broken */
        return snd_pcm_lib_ioctl(substream, cmd, arg);
}

/*---------------------------------------------------------------------------
   snd_trident_allocate_pcm_mem
  
   Description: Allocate PCM ring buffer for given substream
  
   Parameters:  substream  - PCM substream class
                hw_params  - hardware parameters
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_allocate_pcm_mem(struct snd_pcm_substream *substream,
                                        struct snd_pcm_hw_params *hw_params)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        int err;

        if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
                return err;
        if (trident->tlb.entries) {
                if (err > 0) { /* change */
                        if (voice->memblk)
                                snd_trident_free_pages(trident, voice->memblk);
                        voice->memblk = snd_trident_alloc_pages(trident, substream);
                        if (voice->memblk == NULL)
                                return -ENOMEM;
                }
        }
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_allocate_evoice
  
   Description: Allocate extra voice as interrupt generator
  
   Parameters:  substream  - PCM substream class
                hw_params  - hardware parameters
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_allocate_evoice(struct snd_pcm_substream *substream,
                                       struct snd_pcm_hw_params *hw_params)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident_voice *evoice = voice->extra;

        /* voice management */

        if (params_buffer_size(hw_params) / 2 != params_period_size(hw_params)) {
                if (evoice == NULL) {
                        evoice = snd_trident_alloc_voice(trident, SNDRV_TRIDENT_VOICE_TYPE_PCM, 0, 0);
                        if (evoice == NULL)
                                return -ENOMEM;
                        voice->extra = evoice;
                        evoice->substream = substream;
                }
        } else {
                if (evoice != NULL) {
                        snd_trident_free_voice(trident, evoice);
                        voice->extra = evoice = NULL;
                }
        }

        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_hw_params
  
   Description: Set the hardware parameters for the playback device.
  
   Parameters:  substream  - PCM substream class
                hw_params  - hardware parameters
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *hw_params)
{
        int err;

        err = snd_trident_allocate_pcm_mem(substream, hw_params);
        if (err >= 0)
                err = snd_trident_allocate_evoice(substream, hw_params);
        return err;
}

/*---------------------------------------------------------------------------
   snd_trident_playback_hw_free
  
   Description: Release the hardware resources for the playback device.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_hw_free(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident_voice *evoice = voice ? voice->extra : NULL;

        if (trident->tlb.entries) {
                if (voice && voice->memblk) {
                        snd_trident_free_pages(trident, voice->memblk);
                        voice->memblk = NULL;
                }
        }
        snd_pcm_lib_free_pages(substream);
        if (evoice != NULL) {
                snd_trident_free_voice(trident, evoice);
                voice->extra = NULL;
        }
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_playback_prepare
  
   Description: Prepare playback device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_playback_prepare(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident_voice *evoice = voice->extra;
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[substream->number];

        spin_lock_irq(&trident->reg_lock);      

        /* set delta (rate) value */
        voice->Delta = snd_trident_convert_rate(runtime->rate);
        voice->spurious_threshold = snd_trident_spurious_threshold(runtime->rate, runtime->period_size);

        /* set Loop Begin Address */
        if (voice->memblk)
                voice->LBA = voice->memblk->offset;
        else
                voice->LBA = runtime->dma_addr;
 
        voice->CSO = 0;
        voice->ESO = runtime->buffer_size - 1;  /* in samples */
        voice->CTRL = snd_trident_control_mode(substream);
        voice->FMC = 3;
        voice->GVSel = 1;
        voice->EC = 0;
        voice->Alpha = 0;
        voice->FMS = 0;
        voice->Vol = mix->vol;
        voice->RVol = mix->rvol;
        voice->CVol = mix->cvol;
        voice->Pan = mix->pan;
        voice->Attribute = 0;
#if 0
        voice->Attribute = (1<<(30-16))|(2<<(26-16))|
                           (0<<(24-16))|(0x1f<<(19-16));
#else
        voice->Attribute = 0;
#endif

        snd_trident_write_voice_regs(trident, voice);

        if (evoice != NULL) {
                evoice->Delta = voice->Delta;
                evoice->spurious_threshold = voice->spurious_threshold;
                evoice->LBA = voice->LBA;
                evoice->CSO = 0;
                evoice->ESO = (runtime->period_size * 2) + 4 - 1; /* in samples */
                evoice->CTRL = voice->CTRL;
                evoice->FMC = 3;
                evoice->GVSel = trident->device == TRIDENT_DEVICE_ID_SI7018 ? 0 : 1;
                evoice->EC = 0;
                evoice->Alpha = 0;
                evoice->FMS = 0;
                evoice->Vol = 0x3ff;                    /* mute */
                evoice->RVol = evoice->CVol = 0x7f;     /* mute */
                evoice->Pan = 0x7f;                     /* mute */
#if 0
                evoice->Attribute = (1<<(30-16))|(2<<(26-16))|
                                    (0<<(24-16))|(0x1f<<(19-16));
#else
                evoice->Attribute = 0;
#endif
                snd_trident_write_voice_regs(trident, evoice);
                evoice->isync2 = 1;
                evoice->isync_mark = runtime->period_size;
                evoice->ESO = (runtime->period_size * 2) - 1;
        }

        spin_unlock_irq(&trident->reg_lock);

        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_capture_hw_params
  
   Description: Set the hardware parameters for the capture device.
  
   Parameters:  substream  - PCM substream class
                hw_params  - hardware parameters
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_capture_hw_params(struct snd_pcm_substream *substream,
                                         struct snd_pcm_hw_params *hw_params)
{
        return snd_trident_allocate_pcm_mem(substream, hw_params);
}

/*---------------------------------------------------------------------------
   snd_trident_capture_prepare
  
   Description: Prepare capture device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_capture_prepare(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        unsigned int val, ESO_bytes;

        spin_lock_irq(&trident->reg_lock);

        // Initilize the channel and set channel Mode
        outb(0, TRID_REG(trident, LEGACY_DMAR15));

        // Set DMA channel operation mode register
        outb(0x54, TRID_REG(trident, LEGACY_DMAR11));

        // Set channel buffer Address, DMAR0 expects contiguous PCI memory area 
        voice->LBA = runtime->dma_addr;
        outl(voice->LBA, TRID_REG(trident, LEGACY_DMAR0));
        if (voice->memblk)
                voice->LBA = voice->memblk->offset;

        // set ESO
        ESO_bytes = snd_pcm_lib_buffer_bytes(substream) - 1;
        outb((ESO_bytes & 0x00ff0000) >> 16, TRID_REG(trident, LEGACY_DMAR6));
        outw((ESO_bytes & 0x0000ffff), TRID_REG(trident, LEGACY_DMAR4));
        ESO_bytes++;

        // Set channel sample rate, 4.12 format
        val = (((unsigned int) 48000L << 12) + (runtime->rate/2)) / runtime->rate;
        outw(val, TRID_REG(trident, T4D_SBDELTA_DELTA_R));

        // Set channel interrupt blk length
        if (snd_pcm_format_width(runtime->format) == 16) {
                val = (unsigned short) ((ESO_bytes >> 1) - 1);
        } else {
                val = (unsigned short) (ESO_bytes - 1);
        }

        outl((val << 16) | val, TRID_REG(trident, T4D_SBBL_SBCL));

        // Right now, set format and start to run captureing, 
        // continuous run loop enable.
        trident->bDMAStart = 0x19;      // 0001 1001b

        if (snd_pcm_format_width(runtime->format) == 16)
                trident->bDMAStart |= 0x80;
        if (snd_pcm_format_signed(runtime->format))
                trident->bDMAStart |= 0x20;
        if (runtime->channels > 1)
                trident->bDMAStart |= 0x40;

        // Prepare capture intr channel

        voice->Delta = snd_trident_convert_rate(runtime->rate);
        voice->spurious_threshold = snd_trident_spurious_threshold(runtime->rate, runtime->period_size);
        voice->isync = 1;
        voice->isync_mark = runtime->period_size;
        voice->isync_max = runtime->buffer_size;

        // Set voice parameters
        voice->CSO = 0;
        voice->ESO = voice->isync_ESO = (runtime->period_size * 2) + 6 - 1;
        voice->CTRL = snd_trident_control_mode(substream);
        voice->FMC = 3;
        voice->RVol = 0x7f;
        voice->CVol = 0x7f;
        voice->GVSel = 1;
        voice->Pan = 0x7f;              /* mute */
        voice->Vol = 0x3ff;             /* mute */
        voice->EC = 0;
        voice->Alpha = 0;
        voice->FMS = 0;
        voice->Attribute = 0;

        snd_trident_write_voice_regs(trident, voice);

        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_si7018_capture_hw_params
  
   Description: Set the hardware parameters for the capture device.
  
   Parameters:  substream  - PCM substream class
                hw_params  - hardware parameters
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_si7018_capture_hw_params(struct snd_pcm_substream *substream,
                                                struct snd_pcm_hw_params *hw_params)
{
        int err;

        if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
                return err;

        return snd_trident_allocate_evoice(substream, hw_params);
}

/*---------------------------------------------------------------------------
   snd_trident_si7018_capture_hw_free
  
   Description: Release the hardware resources for the capture device.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_si7018_capture_hw_free(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident_voice *evoice = voice ? voice->extra : NULL;

        snd_pcm_lib_free_pages(substream);
        if (evoice != NULL) {
                snd_trident_free_voice(trident, evoice);
                voice->extra = NULL;
        }
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_si7018_capture_prepare
  
   Description: Prepare capture device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_si7018_capture_prepare(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident_voice *evoice = voice->extra;

        spin_lock_irq(&trident->reg_lock);

        voice->LBA = runtime->dma_addr;
        voice->Delta = snd_trident_convert_adc_rate(runtime->rate);
        voice->spurious_threshold = snd_trident_spurious_threshold(runtime->rate, runtime->period_size);

        // Set voice parameters
        voice->CSO = 0;
        voice->ESO = runtime->buffer_size - 1;          /* in samples */
        voice->CTRL = snd_trident_control_mode(substream);
        voice->FMC = 0;
        voice->RVol = 0;
        voice->CVol = 0;
        voice->GVSel = 1;
        voice->Pan = T4D_DEFAULT_PCM_PAN;
        voice->Vol = 0;
        voice->EC = 0;
        voice->Alpha = 0;
        voice->FMS = 0;

        voice->Attribute = (2 << (30-16)) |
                           (2 << (26-16)) |
                           (2 << (24-16)) |
                           (1 << (23-16));

        snd_trident_write_voice_regs(trident, voice);

        if (evoice != NULL) {
                evoice->Delta = snd_trident_convert_rate(runtime->rate);
                evoice->spurious_threshold = voice->spurious_threshold;
                evoice->LBA = voice->LBA;
                evoice->CSO = 0;
                evoice->ESO = (runtime->period_size * 2) + 20 - 1; /* in samples, 20 means correction */
                evoice->CTRL = voice->CTRL;
                evoice->FMC = 3;
                evoice->GVSel = 0;
                evoice->EC = 0;
                evoice->Alpha = 0;
                evoice->FMS = 0;
                evoice->Vol = 0x3ff;                    /* mute */
                evoice->RVol = evoice->CVol = 0x7f;     /* mute */
                evoice->Pan = 0x7f;                     /* mute */
                evoice->Attribute = 0;
                snd_trident_write_voice_regs(trident, evoice);
                evoice->isync2 = 1;
                evoice->isync_mark = runtime->period_size;
                evoice->ESO = (runtime->period_size * 2) - 1;
        }
        
        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_foldback_prepare
  
   Description: Prepare foldback capture device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_foldback_prepare(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident_voice *evoice = voice->extra;

        spin_lock_irq(&trident->reg_lock);

        /* Set channel buffer Address */
        if (voice->memblk)
                voice->LBA = voice->memblk->offset;
        else
                voice->LBA = runtime->dma_addr;

        /* set target ESO for channel */
        voice->ESO = runtime->buffer_size - 1;  /* in samples */

        /* set sample rate */
        voice->Delta = 0x1000;
        voice->spurious_threshold = snd_trident_spurious_threshold(48000, runtime->period_size);

        voice->CSO = 0;
        voice->CTRL = snd_trident_control_mode(substream);
        voice->FMC = 3;
        voice->RVol = 0x7f;
        voice->CVol = 0x7f;
        voice->GVSel = 1;
        voice->Pan = 0x7f;      /* mute */
        voice->Vol = 0x3ff;     /* mute */
        voice->EC = 0;
        voice->Alpha = 0;
        voice->FMS = 0;
        voice->Attribute = 0;

        /* set up capture channel */
        outb(((voice->number & 0x3f) | 0x80), TRID_REG(trident, T4D_RCI + voice->foldback_chan));

        snd_trident_write_voice_regs(trident, voice);

        if (evoice != NULL) {
                evoice->Delta = voice->Delta;
                evoice->spurious_threshold = voice->spurious_threshold;
                evoice->LBA = voice->LBA;
                evoice->CSO = 0;
                evoice->ESO = (runtime->period_size * 2) + 4 - 1; /* in samples */
                evoice->CTRL = voice->CTRL;
                evoice->FMC = 3;
                evoice->GVSel = trident->device == TRIDENT_DEVICE_ID_SI7018 ? 0 : 1;
                evoice->EC = 0;
                evoice->Alpha = 0;
                evoice->FMS = 0;
                evoice->Vol = 0x3ff;                    /* mute */
                evoice->RVol = evoice->CVol = 0x7f;     /* mute */
                evoice->Pan = 0x7f;                     /* mute */
                evoice->Attribute = 0;
                snd_trident_write_voice_regs(trident, evoice);
                evoice->isync2 = 1;
                evoice->isync_mark = runtime->period_size;
                evoice->ESO = (runtime->period_size * 2) - 1;
        }

        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif_hw_params
  
   Description: Set the hardware parameters for the spdif device.
  
   Parameters:  substream  - PCM substream class
                hw_params  - hardware parameters
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_hw_params(struct snd_pcm_substream *substream,
                                       struct snd_pcm_hw_params *hw_params)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        unsigned int old_bits = 0, change = 0;
        int err;

        err = snd_trident_allocate_pcm_mem(substream, hw_params);
        if (err < 0)
                return err;

        if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                err = snd_trident_allocate_evoice(substream, hw_params);
                if (err < 0)
                        return err;
        }

        /* prepare SPDIF channel */
        spin_lock_irq(&trident->reg_lock);
        old_bits = trident->spdif_pcm_bits;
        if (old_bits & IEC958_AES0_PROFESSIONAL)
                trident->spdif_pcm_bits &= ~IEC958_AES0_PRO_FS;
        else
                trident->spdif_pcm_bits &= ~(IEC958_AES3_CON_FS << 24);
        if (params_rate(hw_params) >= 48000) {
                trident->spdif_pcm_ctrl = 0x3c; // 48000 Hz
                trident->spdif_pcm_bits |=
                        trident->spdif_bits & IEC958_AES0_PROFESSIONAL ?
                                IEC958_AES0_PRO_FS_48000 :
                                (IEC958_AES3_CON_FS_48000 << 24);
        }
        else if (params_rate(hw_params) >= 44100) {
                trident->spdif_pcm_ctrl = 0x3e; // 44100 Hz
                trident->spdif_pcm_bits |=
                        trident->spdif_bits & IEC958_AES0_PROFESSIONAL ?
                                IEC958_AES0_PRO_FS_44100 :
                                (IEC958_AES3_CON_FS_44100 << 24);
        }
        else {
                trident->spdif_pcm_ctrl = 0x3d; // 32000 Hz
                trident->spdif_pcm_bits |=
                        trident->spdif_bits & IEC958_AES0_PROFESSIONAL ?
                                IEC958_AES0_PRO_FS_32000 :
                                (IEC958_AES3_CON_FS_32000 << 24);
        }
        change = old_bits != trident->spdif_pcm_bits;
        spin_unlock_irq(&trident->reg_lock);

        if (change)
                snd_ctl_notify(trident->card, SNDRV_CTL_EVENT_MASK_VALUE, &trident->spdif_pcm_ctl->id);

        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif_prepare
  
   Description: Prepare SPDIF device for playback.
  
   Parameters:  substream  - PCM substream class
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_prepare(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident_voice *evoice = voice->extra;
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[substream->number];
        unsigned int RESO, LBAO;
        unsigned int temp;

        spin_lock_irq(&trident->reg_lock);

        if (trident->device != TRIDENT_DEVICE_ID_SI7018) {

                /* set delta (rate) value */
                voice->Delta = snd_trident_convert_rate(runtime->rate);
                voice->spurious_threshold = snd_trident_spurious_threshold(runtime->rate, runtime->period_size);

                /* set Loop Back Address */
                LBAO = runtime->dma_addr;
                if (voice->memblk)
                        voice->LBA = voice->memblk->offset;
                else
                        voice->LBA = LBAO;

                voice->isync = 1;
                voice->isync3 = 1;
                voice->isync_mark = runtime->period_size;
                voice->isync_max = runtime->buffer_size;

                /* set target ESO for channel */
                RESO = runtime->buffer_size - 1;
                voice->ESO = voice->isync_ESO = (runtime->period_size * 2) + 6 - 1;

                /* set ctrl mode */
                voice->CTRL = snd_trident_control_mode(substream);

                voice->FMC = 3;
                voice->RVol = 0x7f;
                voice->CVol = 0x7f;
                voice->GVSel = 1;
                voice->Pan = 0x7f;
                voice->Vol = 0x3ff;
                voice->EC = 0;
                voice->CSO = 0;
                voice->Alpha = 0;
                voice->FMS = 0;
                voice->Attribute = 0;

                /* prepare surrogate IRQ channel */
                snd_trident_write_voice_regs(trident, voice);

                outw((RESO & 0xffff), TRID_REG(trident, NX_SPESO));
                outb((RESO >> 16), TRID_REG(trident, NX_SPESO + 2));
                outl((LBAO & 0xfffffffc), TRID_REG(trident, NX_SPLBA));
                outw((voice->CSO & 0xffff), TRID_REG(trident, NX_SPCTRL_SPCSO));
                outb((voice->CSO >> 16), TRID_REG(trident, NX_SPCTRL_SPCSO + 2));

                /* set SPDIF setting */
                outb(trident->spdif_pcm_ctrl, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));
                outl(trident->spdif_pcm_bits, TRID_REG(trident, NX_SPCSTATUS));

        } else {        /* SiS */
        
                /* set delta (rate) value */
                voice->Delta = 0x800;
                voice->spurious_threshold = snd_trident_spurious_threshold(48000, runtime->period_size);

                /* set Loop Begin Address */
                if (voice->memblk)
                        voice->LBA = voice->memblk->offset;
                else
                        voice->LBA = runtime->dma_addr;

                voice->CSO = 0;
                voice->ESO = runtime->buffer_size - 1;  /* in samples */
                voice->CTRL = snd_trident_control_mode(substream);
                voice->FMC = 3;
                voice->GVSel = 1;
                voice->EC = 0;
                voice->Alpha = 0;
                voice->FMS = 0;
                voice->Vol = mix->vol;
                voice->RVol = mix->rvol;
                voice->CVol = mix->cvol;
                voice->Pan = mix->pan;
                voice->Attribute = (1<<(30-16))|(7<<(26-16))|
                                   (0<<(24-16))|(0<<(19-16));

                snd_trident_write_voice_regs(trident, voice);

                if (evoice != NULL) {
                        evoice->Delta = voice->Delta;
                        evoice->spurious_threshold = voice->spurious_threshold;
                        evoice->LBA = voice->LBA;
                        evoice->CSO = 0;
                        evoice->ESO = (runtime->period_size * 2) + 4 - 1; /* in samples */
                        evoice->CTRL = voice->CTRL;
                        evoice->FMC = 3;
                        evoice->GVSel = trident->device == TRIDENT_DEVICE_ID_SI7018 ? 0 : 1;
                        evoice->EC = 0;
                        evoice->Alpha = 0;
                        evoice->FMS = 0;
                        evoice->Vol = 0x3ff;                    /* mute */
                        evoice->RVol = evoice->CVol = 0x7f;     /* mute */
                        evoice->Pan = 0x7f;                     /* mute */
                        evoice->Attribute = 0;
                        snd_trident_write_voice_regs(trident, evoice);
                        evoice->isync2 = 1;
                        evoice->isync_mark = runtime->period_size;
                        evoice->ESO = (runtime->period_size * 2) - 1;
                }

                outl(trident->spdif_pcm_bits, TRID_REG(trident, SI_SPDIF_CS));
                temp = inl(TRID_REG(trident, T4D_LFO_GC_CIR));
                temp &= ~(1<<19);
                outl(temp, TRID_REG(trident, T4D_LFO_GC_CIR));
                temp = inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL));
                temp |= SPDIF_EN;
                outl(temp, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
        }

        spin_unlock_irq(&trident->reg_lock);

        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_trigger
  
   Description: Start/stop devices
  
   Parameters:  substream  - PCM substream class
                cmd     - trigger command (STOP, GO)
  
   Returns:     Error status
  
  ---------------------------------------------------------------------------*/

static int snd_trident_trigger(struct snd_pcm_substream *substream,
                               int cmd)
                                    
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_substream *s;
        unsigned int what, whati, capture_flag, spdif_flag;
        struct snd_trident_voice *voice, *evoice;
        unsigned int val, go;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
        case SNDRV_PCM_TRIGGER_RESUME:
                go = 1;
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
        case SNDRV_PCM_TRIGGER_SUSPEND:
                go = 0;
                break;
        default:
                return -EINVAL;
        }
        what = whati = capture_flag = spdif_flag = 0;
        spin_lock(&trident->reg_lock);
        val = inl(TRID_REG(trident, T4D_STIMER)) & 0x00ffffff;
        snd_pcm_group_for_each_entry(s, substream) {
                if ((struct snd_trident *) snd_pcm_substream_chip(s) == trident) {
                        voice = s->runtime->private_data;
                        evoice = voice->extra;
                        what |= 1 << (voice->number & 0x1f);
                        if (evoice == NULL) {
                                whati |= 1 << (voice->number & 0x1f);
                        } else {
                                what |= 1 << (evoice->number & 0x1f);
                                whati |= 1 << (evoice->number & 0x1f);
                                if (go)
                                        evoice->stimer = val;
                        }
                        if (go) {
                                voice->running = 1;
                                voice->stimer = val;
                        } else {
                                voice->running = 0;
                        }
                        snd_pcm_trigger_done(s, substream);
                        if (voice->capture)
                                capture_flag = 1;
                        if (voice->spdif)
                                spdif_flag = 1;
                }
        }
        if (spdif_flag) {
                if (trident->device != TRIDENT_DEVICE_ID_SI7018) {
                        outl(trident->spdif_pcm_bits, TRID_REG(trident, NX_SPCSTATUS));
                        val = trident->spdif_pcm_ctrl;
                        if (!go)
                                val &= ~(0x28);
                        outb(val, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));
                } else {
                        outl(trident->spdif_pcm_bits, TRID_REG(trident, SI_SPDIF_CS));
                        val = inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL)) | SPDIF_EN;
                        outl(val, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
                }
        }
        if (!go)
                outl(what, TRID_REG(trident, T4D_STOP_B));
        val = inl(TRID_REG(trident, T4D_AINTEN_B));
        if (go) {
                val |= whati;
        } else {
                val &= ~whati;
        }
        outl(val, TRID_REG(trident, T4D_AINTEN_B));
        if (go) {
                outl(what, TRID_REG(trident, T4D_START_B));

                if (capture_flag && trident->device != TRIDENT_DEVICE_ID_SI7018)
                        outb(trident->bDMAStart, TRID_REG(trident, T4D_SBCTRL_SBE2R_SBDD));
        } else {
                if (capture_flag && trident->device != TRIDENT_DEVICE_ID_SI7018)
                        outb(0x00, TRID_REG(trident, T4D_SBCTRL_SBE2R_SBDD));
        }
        spin_unlock(&trident->reg_lock);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_playback_pointer
  
   Description: This routine return the playback position
                
   Parameters:  substream  - PCM substream class

   Returns:     position of buffer
  
  ---------------------------------------------------------------------------*/

static snd_pcm_uframes_t snd_trident_playback_pointer(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        unsigned int cso;

        if (!voice->running)
                return 0;

        spin_lock(&trident->reg_lock);

        outb(voice->number, TRID_REG(trident, T4D_LFO_GC_CIR));

        if (trident->device != TRIDENT_DEVICE_ID_NX) {
                cso = inw(TRID_REG(trident, CH_DX_CSO_ALPHA_FMS + 2));
        } else {                // ID_4DWAVE_NX
                cso = (unsigned int) inl(TRID_REG(trident, CH_NX_DELTA_CSO)) & 0x00ffffff;
        }

        spin_unlock(&trident->reg_lock);

        if (cso >= runtime->buffer_size)
                cso = 0;

        return cso;
}

/*---------------------------------------------------------------------------
   snd_trident_capture_pointer
  
   Description: This routine return the capture position
                
   Parameters:   pcm1    - PCM device class

   Returns:     position of buffer
  
  ---------------------------------------------------------------------------*/

static snd_pcm_uframes_t snd_trident_capture_pointer(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        unsigned int result;

        if (!voice->running)
                return 0;

        result = inw(TRID_REG(trident, T4D_SBBL_SBCL));
        if (runtime->channels > 1)
                result >>= 1;
        if (result > 0)
                result = runtime->buffer_size - result;

        return result;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif_pointer
  
   Description: This routine return the SPDIF playback position
                
   Parameters:  substream  - PCM substream class

   Returns:     position of buffer
  
  ---------------------------------------------------------------------------*/

static snd_pcm_uframes_t snd_trident_spdif_pointer(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;
        unsigned int result;

        if (!voice->running)
                return 0;

        result = inl(TRID_REG(trident, NX_SPCTRL_SPCSO)) & 0x00ffffff;

        return result;
}

/*
 *  Playback support device description
 */

static struct snd_pcm_hardware snd_trident_playback =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_SYNC_START |
                                 SNDRV_PCM_INFO_PAUSE /* | SNDRV_PCM_INFO_RESUME */),
        .formats =              (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
                                 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
        .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             4000,
        .rate_max =             48000,
        .channels_min =         1,
        .channels_max =         2,
        .buffer_bytes_max =     (256*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (256*1024),
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

/*
 *  Capture support device description
 */

static struct snd_pcm_hardware snd_trident_capture =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_SYNC_START |
                                 SNDRV_PCM_INFO_PAUSE /* | SNDRV_PCM_INFO_RESUME */),
        .formats =              (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
                                 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
        .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             4000,
        .rate_max =             48000,
        .channels_min =         1,
        .channels_max =         2,
        .buffer_bytes_max =     (128*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

/*
 *  Foldback capture support device description
 */

static struct snd_pcm_hardware snd_trident_foldback =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_SYNC_START |
                                 SNDRV_PCM_INFO_PAUSE /* | SNDRV_PCM_INFO_RESUME */),
        .formats =              SNDRV_PCM_FMTBIT_S16_LE,
        .rates =                SNDRV_PCM_RATE_48000,
        .rate_min =             48000,
        .rate_max =             48000,
        .channels_min =         2,
        .channels_max =         2,
        .buffer_bytes_max =     (128*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

/*
 *  SPDIF playback support device description
 */

static struct snd_pcm_hardware snd_trident_spdif =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_SYNC_START |
                                 SNDRV_PCM_INFO_PAUSE /* | SNDRV_PCM_INFO_RESUME */),
        .formats =              SNDRV_PCM_FMTBIT_S16_LE,
        .rates =                (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
                                 SNDRV_PCM_RATE_48000),
        .rate_min =             32000,
        .rate_max =             48000,
        .channels_min =         2,
        .channels_max =         2,
        .buffer_bytes_max =     (128*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

static struct snd_pcm_hardware snd_trident_spdif_7018 =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_SYNC_START |
                                 SNDRV_PCM_INFO_PAUSE /* | SNDRV_PCM_INFO_RESUME */),
        .formats =              SNDRV_PCM_FMTBIT_S16_LE,
        .rates =                SNDRV_PCM_RATE_48000,
        .rate_min =             48000,
        .rate_max =             48000,
        .channels_min =         2,
        .channels_max =         2,
        .buffer_bytes_max =     (128*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

static void snd_trident_pcm_free_substream(struct snd_pcm_runtime *runtime)
{
        struct snd_trident_voice *voice = runtime->private_data;
        struct snd_trident *trident;

        if (voice) {
                trident = voice->trident;
                snd_trident_free_voice(trident, voice);
        }
}

static int snd_trident_playback_open(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice;

        voice = snd_trident_alloc_voice(trident, SNDRV_TRIDENT_VOICE_TYPE_PCM, 0, 0);
        if (voice == NULL)
                return -EAGAIN;
        snd_trident_pcm_mixer_build(trident, voice, substream);
        voice->substream = substream;
        runtime->private_data = voice;
        runtime->private_free = snd_trident_pcm_free_substream;
        runtime->hw = snd_trident_playback;
        snd_pcm_set_sync(substream);
        snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_playback_close
  
   Description: This routine will close the 4DWave playback device. For now 
                we will simply free the dma transfer buffer.
                
   Parameters:  substream  - PCM substream class

  ---------------------------------------------------------------------------*/
static int snd_trident_playback_close(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct snd_trident_voice *voice = runtime->private_data;

        snd_trident_pcm_mixer_free(trident, voice, substream);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif_open
  
   Description: This routine will open the 4DWave SPDIF device.

   Parameters:  substream  - PCM substream class

   Returns:     status  - success or failure flag
  
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_open(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_trident_voice *voice;
        struct snd_pcm_runtime *runtime = substream->runtime;
        
        voice = snd_trident_alloc_voice(trident, SNDRV_TRIDENT_VOICE_TYPE_PCM, 0, 0);
        if (voice == NULL)
                return -EAGAIN;
        voice->spdif = 1;
        voice->substream = substream;
        spin_lock_irq(&trident->reg_lock);
        trident->spdif_pcm_bits = trident->spdif_bits;
        spin_unlock_irq(&trident->reg_lock);

        runtime->private_data = voice;
        runtime->private_free = snd_trident_pcm_free_substream;
        if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                runtime->hw = snd_trident_spdif;
        } else {
                runtime->hw = snd_trident_spdif_7018;
        }

        trident->spdif_pcm_ctl->vd[0].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        snd_ctl_notify(trident->card, SNDRV_CTL_EVENT_MASK_VALUE |
                       SNDRV_CTL_EVENT_MASK_INFO, &trident->spdif_pcm_ctl->id);

        snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
        return 0;
}


/*---------------------------------------------------------------------------
   snd_trident_spdif_close
  
   Description: This routine will close the 4DWave SPDIF device.
                
   Parameters:  substream  - PCM substream class

  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_close(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        unsigned int temp;

        spin_lock_irq(&trident->reg_lock);
        // restore default SPDIF setting
        if (trident->device != TRIDENT_DEVICE_ID_SI7018) {
                outb(trident->spdif_ctrl, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));
                outl(trident->spdif_bits, TRID_REG(trident, NX_SPCSTATUS));
        } else {
                outl(trident->spdif_bits, TRID_REG(trident, SI_SPDIF_CS));
                temp = inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL));
                if (trident->spdif_ctrl) {
                        temp |= SPDIF_EN;
                } else {
                        temp &= ~SPDIF_EN;
                }
                outl(temp, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
        }
        spin_unlock_irq(&trident->reg_lock);
        trident->spdif_pcm_ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        snd_ctl_notify(trident->card, SNDRV_CTL_EVENT_MASK_VALUE |
                       SNDRV_CTL_EVENT_MASK_INFO, &trident->spdif_pcm_ctl->id);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_capture_open
  
   Description: This routine will open the 4DWave capture device.

   Parameters:  substream  - PCM substream class

   Returns:     status  - success or failure flag

  ---------------------------------------------------------------------------*/

static int snd_trident_capture_open(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_trident_voice *voice;
        struct snd_pcm_runtime *runtime = substream->runtime;

        voice = snd_trident_alloc_voice(trident, SNDRV_TRIDENT_VOICE_TYPE_PCM, 0, 0);
        if (voice == NULL)
                return -EAGAIN;
        voice->capture = 1;
        voice->substream = substream;
        runtime->private_data = voice;
        runtime->private_free = snd_trident_pcm_free_substream;
        runtime->hw = snd_trident_capture;
        snd_pcm_set_sync(substream);
        snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_capture_close
  
   Description: This routine will close the 4DWave capture device. For now 
                we will simply free the dma transfer buffer.
                
   Parameters:  substream  - PCM substream class

  ---------------------------------------------------------------------------*/
static int snd_trident_capture_close(struct snd_pcm_substream *substream)
{
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_foldback_open
  
   Description: This routine will open the 4DWave foldback capture device.

   Parameters:  substream  - PCM substream class

   Returns:     status  - success or failure flag

  ---------------------------------------------------------------------------*/

static int snd_trident_foldback_open(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_trident_voice *voice;
        struct snd_pcm_runtime *runtime = substream->runtime;

        voice = snd_trident_alloc_voice(trident, SNDRV_TRIDENT_VOICE_TYPE_PCM, 0, 0);
        if (voice == NULL)
                return -EAGAIN;
        voice->foldback_chan = substream->number;
        voice->substream = substream;
        runtime->private_data = voice;
        runtime->private_free = snd_trident_pcm_free_substream;
        runtime->hw = snd_trident_foldback;
        snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_foldback_close
  
   Description: This routine will close the 4DWave foldback capture device. 
                For now we will simply free the dma transfer buffer.
                
   Parameters:  substream  - PCM substream class

  ---------------------------------------------------------------------------*/
static int snd_trident_foldback_close(struct snd_pcm_substream *substream)
{
        struct snd_trident *trident = snd_pcm_substream_chip(substream);
        struct snd_trident_voice *voice;
        struct snd_pcm_runtime *runtime = substream->runtime;
        voice = runtime->private_data;
        
        /* stop capture channel */
        spin_lock_irq(&trident->reg_lock);
        outb(0x00, TRID_REG(trident, T4D_RCI + voice->foldback_chan));
        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

/*---------------------------------------------------------------------------
   PCM operations
  ---------------------------------------------------------------------------*/

static struct snd_pcm_ops snd_trident_playback_ops = {
        .open =         snd_trident_playback_open,
        .close =        snd_trident_playback_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_hw_params,
        .hw_free =      snd_trident_hw_free,
        .prepare =      snd_trident_playback_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_playback_pointer,
};

static struct snd_pcm_ops snd_trident_nx_playback_ops = {
        .open =         snd_trident_playback_open,
        .close =        snd_trident_playback_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_hw_params,
        .hw_free =      snd_trident_hw_free,
        .prepare =      snd_trident_playback_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_playback_pointer,
        .page =         snd_pcm_sgbuf_ops_page,
};

static struct snd_pcm_ops snd_trident_capture_ops = {
        .open =         snd_trident_capture_open,
        .close =        snd_trident_capture_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_capture_hw_params,
        .hw_free =      snd_trident_hw_free,
        .prepare =      snd_trident_capture_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_capture_pointer,
};

static struct snd_pcm_ops snd_trident_si7018_capture_ops = {
        .open =         snd_trident_capture_open,
        .close =        snd_trident_capture_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_si7018_capture_hw_params,
        .hw_free =      snd_trident_si7018_capture_hw_free,
        .prepare =      snd_trident_si7018_capture_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_playback_pointer,
};

static struct snd_pcm_ops snd_trident_foldback_ops = {
        .open =         snd_trident_foldback_open,
        .close =        snd_trident_foldback_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_hw_params,
        .hw_free =      snd_trident_hw_free,
        .prepare =      snd_trident_foldback_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_playback_pointer,
};

static struct snd_pcm_ops snd_trident_nx_foldback_ops = {
        .open =         snd_trident_foldback_open,
        .close =        snd_trident_foldback_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_hw_params,
        .hw_free =      snd_trident_hw_free,
        .prepare =      snd_trident_foldback_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_playback_pointer,
        .page =         snd_pcm_sgbuf_ops_page,
};

static struct snd_pcm_ops snd_trident_spdif_ops = {
        .open =         snd_trident_spdif_open,
        .close =        snd_trident_spdif_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_spdif_hw_params,
        .hw_free =      snd_trident_hw_free,
        .prepare =      snd_trident_spdif_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_spdif_pointer,
};

static struct snd_pcm_ops snd_trident_spdif_7018_ops = {
        .open =         snd_trident_spdif_open,
        .close =        snd_trident_spdif_close,
        .ioctl =        snd_trident_ioctl,
        .hw_params =    snd_trident_spdif_hw_params,
        .hw_free =      snd_trident_hw_free,
        .prepare =      snd_trident_spdif_prepare,
        .trigger =      snd_trident_trigger,
        .pointer =      snd_trident_playback_pointer,
};

/*---------------------------------------------------------------------------
   snd_trident_pcm
  
   Description: This routine registers the 4DWave device for PCM support.
                
   Parameters:  trident - pointer to target device class for 4DWave.

   Returns:     None
  
  ---------------------------------------------------------------------------*/

int __devinit snd_trident_pcm(struct snd_trident * trident,
                              int device, struct snd_pcm ** rpcm)
{
        struct snd_pcm *pcm;
        int err;

        if (rpcm)
                *rpcm = NULL;
        if ((err = snd_pcm_new(trident->card, "trident_dx_nx", device, trident->ChanPCM, 1, &pcm)) < 0)
                return err;

        pcm->private_data = trident;

        if (trident->tlb.entries) {
                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_trident_nx_playback_ops);
        } else {
                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_trident_playback_ops);
        }
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
                        trident->device != TRIDENT_DEVICE_ID_SI7018 ?
                        &snd_trident_capture_ops :
                        &snd_trident_si7018_capture_ops);

        pcm->info_flags = 0;
        pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
        strcpy(pcm->name, "Trident 4DWave");
        trident->pcm = pcm;

        if (trident->tlb.entries) {
                struct snd_pcm_substream *substream;
                for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next)
                        snd_pcm_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV_SG,
                                                      snd_dma_pci_data(trident->pci),
                                                      64*1024, 128*1024);
                snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
                                              SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(trident->pci),
                                              64*1024, 128*1024);
        } else {
                snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                                      snd_dma_pci_data(trident->pci), 64*1024, 128*1024);
        }

        if (rpcm)
                *rpcm = pcm;
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_foldback_pcm
  
   Description: This routine registers the 4DWave device for foldback PCM support.
                
   Parameters:  trident - pointer to target device class for 4DWave.

   Returns:     None
  
  ---------------------------------------------------------------------------*/

int __devinit snd_trident_foldback_pcm(struct snd_trident * trident,
                                       int device, struct snd_pcm ** rpcm)
{
        struct snd_pcm *foldback;
        int err;
        int num_chan = 3;
        struct snd_pcm_substream *substream;

        if (rpcm)
                *rpcm = NULL;
        if (trident->device == TRIDENT_DEVICE_ID_NX)
                num_chan = 4;
        if ((err = snd_pcm_new(trident->card, "trident_dx_nx", device, 0, num_chan, &foldback)) < 0)
                return err;

        foldback->private_data = trident;
        if (trident->tlb.entries)
                snd_pcm_set_ops(foldback, SNDRV_PCM_STREAM_CAPTURE, &snd_trident_nx_foldback_ops);
        else
                snd_pcm_set_ops(foldback, SNDRV_PCM_STREAM_CAPTURE, &snd_trident_foldback_ops);
        foldback->info_flags = 0;
        strcpy(foldback->name, "Trident 4DWave");
        substream = foldback->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
        strcpy(substream->name, "Front Mixer");
        substream = substream->next;
        strcpy(substream->name, "Reverb Mixer");
        substream = substream->next;
        strcpy(substream->name, "Chorus Mixer");
        if (num_chan == 4) {
                substream = substream->next;
                strcpy(substream->name, "Second AC'97 ADC");
        }
        trident->foldback = foldback;

        if (trident->tlb.entries)
                snd_pcm_lib_preallocate_pages_for_all(foldback, SNDRV_DMA_TYPE_DEV_SG,
                                                      snd_dma_pci_data(trident->pci), 0, 128*1024);
        else
                snd_pcm_lib_preallocate_pages_for_all(foldback, SNDRV_DMA_TYPE_DEV,
                                                      snd_dma_pci_data(trident->pci), 64*1024, 128*1024);

        if (rpcm)
                *rpcm = foldback;
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_spdif
  
   Description: This routine registers the 4DWave-NX device for SPDIF support.
                
   Parameters:  trident - pointer to target device class for 4DWave-NX.

   Returns:     None
  
  ---------------------------------------------------------------------------*/

int __devinit snd_trident_spdif_pcm(struct snd_trident * trident,
                                    int device, struct snd_pcm ** rpcm)
{
        struct snd_pcm *spdif;
        int err;

        if (rpcm)
                *rpcm = NULL;
        if ((err = snd_pcm_new(trident->card, "trident_dx_nx IEC958", device, 1, 0, &spdif)) < 0)
                return err;

        spdif->private_data = trident;
        if (trident->device != TRIDENT_DEVICE_ID_SI7018) {
                snd_pcm_set_ops(spdif, SNDRV_PCM_STREAM_PLAYBACK, &snd_trident_spdif_ops);
        } else {
                snd_pcm_set_ops(spdif, SNDRV_PCM_STREAM_PLAYBACK, &snd_trident_spdif_7018_ops);
        }
        spdif->info_flags = 0;
        strcpy(spdif->name, "Trident 4DWave IEC958");
        trident->spdif = spdif;

        snd_pcm_lib_preallocate_pages_for_all(spdif, SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(trident->pci), 64*1024, 128*1024);

        if (rpcm)
                *rpcm = spdif;
        return 0;
}

/*
 *  Mixer part
 */


/*---------------------------------------------------------------------------
    snd_trident_spdif_control

    Description: enable/disable S/PDIF out from ac97 mixer
  ---------------------------------------------------------------------------*/

#define snd_trident_spdif_control_info  snd_ctl_boolean_mono_info

static int snd_trident_spdif_control_get(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned char val;

        spin_lock_irq(&trident->reg_lock);
        val = trident->spdif_ctrl;
        ucontrol->value.integer.value[0] = val == kcontrol->private_value;
        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

static int snd_trident_spdif_control_put(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned char val;
        int change;

        val = ucontrol->value.integer.value[0] ? (unsigned char) kcontrol->private_value : 0x00;
        spin_lock_irq(&trident->reg_lock);
        /* S/PDIF C Channel bits 0-31 : 48khz, SCMS disabled */
        change = trident->spdif_ctrl != val;
        trident->spdif_ctrl = val;
        if (trident->device != TRIDENT_DEVICE_ID_SI7018) {
                if ((inb(TRID_REG(trident, NX_SPCTRL_SPCSO + 3)) & 0x10) == 0) {
                        outl(trident->spdif_bits, TRID_REG(trident, NX_SPCSTATUS));
                        outb(trident->spdif_ctrl, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));
                }
        } else {
                if (trident->spdif == NULL) {
                        unsigned int temp;
                        outl(trident->spdif_bits, TRID_REG(trident, SI_SPDIF_CS));
                        temp = inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL)) & ~SPDIF_EN;
                        if (val)
                                temp |= SPDIF_EN;
                        outl(temp, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
                }
        }
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_spdif_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,SWITCH),
        .info =         snd_trident_spdif_control_info,
        .get =          snd_trident_spdif_control_get,
        .put =          snd_trident_spdif_control_put,
        .private_value = 0x28,
};

/*---------------------------------------------------------------------------
    snd_trident_spdif_default

    Description: put/get the S/PDIF default settings
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_default_info(struct snd_kcontrol *kcontrol,
                                          struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
        uinfo->count = 1;
        return 0;
}

static int snd_trident_spdif_default_get(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);

        spin_lock_irq(&trident->reg_lock);
        ucontrol->value.iec958.status[0] = (trident->spdif_bits >> 0) & 0xff;
        ucontrol->value.iec958.status[1] = (trident->spdif_bits >> 8) & 0xff;
        ucontrol->value.iec958.status[2] = (trident->spdif_bits >> 16) & 0xff;
        ucontrol->value.iec958.status[3] = (trident->spdif_bits >> 24) & 0xff;
        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

static int snd_trident_spdif_default_put(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned int val;
        int change;

        val = (ucontrol->value.iec958.status[0] << 0) |
              (ucontrol->value.iec958.status[1] << 8) |
              (ucontrol->value.iec958.status[2] << 16) |
              (ucontrol->value.iec958.status[3] << 24);
        spin_lock_irq(&trident->reg_lock);
        change = trident->spdif_bits != val;
        trident->spdif_bits = val;
        if (trident->device != TRIDENT_DEVICE_ID_SI7018) {
                if ((inb(TRID_REG(trident, NX_SPCTRL_SPCSO + 3)) & 0x10) == 0)
                        outl(trident->spdif_bits, TRID_REG(trident, NX_SPCSTATUS));
        } else {
                if (trident->spdif == NULL)
                        outl(trident->spdif_bits, TRID_REG(trident, SI_SPDIF_CS));
        }
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_spdif_default __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
        .info =         snd_trident_spdif_default_info,
        .get =          snd_trident_spdif_default_get,
        .put =          snd_trident_spdif_default_put
};

/*---------------------------------------------------------------------------
    snd_trident_spdif_mask

    Description: put/get the S/PDIF mask
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_mask_info(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
        uinfo->count = 1;
        return 0;
}

static int snd_trident_spdif_mask_get(struct snd_kcontrol *kcontrol,
                                      struct snd_ctl_elem_value *ucontrol)
{
        ucontrol->value.iec958.status[0] = 0xff;
        ucontrol->value.iec958.status[1] = 0xff;
        ucontrol->value.iec958.status[2] = 0xff;
        ucontrol->value.iec958.status[3] = 0xff;
        return 0;
}

static struct snd_kcontrol_new snd_trident_spdif_mask __devinitdata =
{
        .access =       SNDRV_CTL_ELEM_ACCESS_READ,
        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
        .info =         snd_trident_spdif_mask_info,
        .get =          snd_trident_spdif_mask_get,
};

/*---------------------------------------------------------------------------
    snd_trident_spdif_stream

    Description: put/get the S/PDIF stream settings
  ---------------------------------------------------------------------------*/

static int snd_trident_spdif_stream_info(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
        uinfo->count = 1;
        return 0;
}

static int snd_trident_spdif_stream_get(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);

        spin_lock_irq(&trident->reg_lock);
        ucontrol->value.iec958.status[0] = (trident->spdif_pcm_bits >> 0) & 0xff;
        ucontrol->value.iec958.status[1] = (trident->spdif_pcm_bits >> 8) & 0xff;
        ucontrol->value.iec958.status[2] = (trident->spdif_pcm_bits >> 16) & 0xff;
        ucontrol->value.iec958.status[3] = (trident->spdif_pcm_bits >> 24) & 0xff;
        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

static int snd_trident_spdif_stream_put(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned int val;
        int change;

        val = (ucontrol->value.iec958.status[0] << 0) |
              (ucontrol->value.iec958.status[1] << 8) |
              (ucontrol->value.iec958.status[2] << 16) |
              (ucontrol->value.iec958.status[3] << 24);
        spin_lock_irq(&trident->reg_lock);
        change = trident->spdif_pcm_bits != val;
        trident->spdif_pcm_bits = val;
        if (trident->spdif != NULL) {
                if (trident->device != TRIDENT_DEVICE_ID_SI7018) {
                        outl(trident->spdif_pcm_bits, TRID_REG(trident, NX_SPCSTATUS));
                } else {
                        outl(trident->spdif_bits, TRID_REG(trident, SI_SPDIF_CS));
                }
        }
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_spdif_stream __devinitdata =
{
        .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
        .info =         snd_trident_spdif_stream_info,
        .get =          snd_trident_spdif_stream_get,
        .put =          snd_trident_spdif_stream_put
};

/*---------------------------------------------------------------------------
    snd_trident_ac97_control

    Description: enable/disable rear path for ac97
  ---------------------------------------------------------------------------*/

#define snd_trident_ac97_control_info   snd_ctl_boolean_mono_info

static int snd_trident_ac97_control_get(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned char val;

        spin_lock_irq(&trident->reg_lock);
        val = trident->ac97_ctrl = inl(TRID_REG(trident, NX_ACR0_AC97_COM_STAT));
        ucontrol->value.integer.value[0] = (val & (1 << kcontrol->private_value)) ? 1 : 0;
        spin_unlock_irq(&trident->reg_lock);
        return 0;
}

static int snd_trident_ac97_control_put(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned char val;
        int change = 0;

        spin_lock_irq(&trident->reg_lock);
        val = trident->ac97_ctrl = inl(TRID_REG(trident, NX_ACR0_AC97_COM_STAT));
        val &= ~(1 << kcontrol->private_value);
        if (ucontrol->value.integer.value[0])
                val |= 1 << kcontrol->private_value;
        change = val != trident->ac97_ctrl;
        trident->ac97_ctrl = val;
        outl(trident->ac97_ctrl = val, TRID_REG(trident, NX_ACR0_AC97_COM_STAT));
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_ac97_rear_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         "Rear Path",
        .info =         snd_trident_ac97_control_info,
        .get =          snd_trident_ac97_control_get,
        .put =          snd_trident_ac97_control_put,
        .private_value = 4,
};

/*---------------------------------------------------------------------------
    snd_trident_vol_control

    Description: wave & music volume control
  ---------------------------------------------------------------------------*/

static int snd_trident_vol_control_info(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 2;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 255;
        return 0;
}

static int snd_trident_vol_control_get(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned int val;

        val = trident->musicvol_wavevol;
        ucontrol->value.integer.value[0] = 255 - ((val >> kcontrol->private_value) & 0xff);
        ucontrol->value.integer.value[1] = 255 - ((val >> (kcontrol->private_value + 8)) & 0xff);
        return 0;
}

static const DECLARE_TLV_DB_SCALE(db_scale_gvol, -6375, 25, 0);

static int snd_trident_vol_control_put(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        unsigned int val;
        int change = 0;

        spin_lock_irq(&trident->reg_lock);
        val = trident->musicvol_wavevol;
        val &= ~(0xffff << kcontrol->private_value);
        val |= ((255 - (ucontrol->value.integer.value[0] & 0xff)) |
                ((255 - (ucontrol->value.integer.value[1] & 0xff)) << 8)) << kcontrol->private_value;
        change = val != trident->musicvol_wavevol;
        outl(trident->musicvol_wavevol = val, TRID_REG(trident, T4D_MUSICVOL_WAVEVOL));
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_vol_music_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         "Music Playback Volume",
        .info =         snd_trident_vol_control_info,
        .get =          snd_trident_vol_control_get,
        .put =          snd_trident_vol_control_put,
        .private_value = 16,
        .tlv = { .p = db_scale_gvol },
};

static struct snd_kcontrol_new snd_trident_vol_wave_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         "Wave Playback Volume",
        .info =         snd_trident_vol_control_info,
        .get =          snd_trident_vol_control_get,
        .put =          snd_trident_vol_control_put,
        .private_value = 0,
        .tlv = { .p = db_scale_gvol },
};

/*---------------------------------------------------------------------------
    snd_trident_pcm_vol_control

    Description: PCM front volume control
  ---------------------------------------------------------------------------*/

static int snd_trident_pcm_vol_control_info(struct snd_kcontrol *kcontrol,
                                            struct snd_ctl_elem_info *uinfo)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 255;
        if (trident->device == TRIDENT_DEVICE_ID_SI7018)
                uinfo->value.integer.max = 1023;
        return 0;
}

static int snd_trident_pcm_vol_control_get(struct snd_kcontrol *kcontrol,
                                           struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];

        if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                ucontrol->value.integer.value[0] = 1023 - mix->vol;
        } else {
                ucontrol->value.integer.value[0] = 255 - (mix->vol>>2);
        }
        return 0;
}

static int snd_trident_pcm_vol_control_put(struct snd_kcontrol *kcontrol,
                                           struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];
        unsigned int val;
        int change = 0;

        if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                val = 1023 - (ucontrol->value.integer.value[0] & 1023);
        } else {
                val = (255 - (ucontrol->value.integer.value[0] & 255)) << 2;
        }
        spin_lock_irq(&trident->reg_lock);
        change = val != mix->vol;
        mix->vol = val;
        if (mix->voice != NULL)
                snd_trident_write_vol_reg(trident, mix->voice, val);
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_pcm_vol_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         "PCM Front Playback Volume",
        .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
        .count =        32,
        .info =         snd_trident_pcm_vol_control_info,
        .get =          snd_trident_pcm_vol_control_get,
        .put =          snd_trident_pcm_vol_control_put,
        /* FIXME: no tlv yet */
};

/*---------------------------------------------------------------------------
    snd_trident_pcm_pan_control

    Description: PCM front pan control
  ---------------------------------------------------------------------------*/

static int snd_trident_pcm_pan_control_info(struct snd_kcontrol *kcontrol,
                                            struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 127;
        return 0;
}

static int snd_trident_pcm_pan_control_get(struct snd_kcontrol *kcontrol,
                                           struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];

        ucontrol->value.integer.value[0] = mix->pan;
        if (ucontrol->value.integer.value[0] & 0x40) {
                ucontrol->value.integer.value[0] = (0x3f - (ucontrol->value.integer.value[0] & 0x3f));
        } else {
                ucontrol->value.integer.value[0] |= 0x40;
        }
        return 0;
}

static int snd_trident_pcm_pan_control_put(struct snd_kcontrol *kcontrol,
                                           struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];
        unsigned char val;
        int change = 0;

        if (ucontrol->value.integer.value[0] & 0x40)
                val = ucontrol->value.integer.value[0] & 0x3f;
        else
                val = (0x3f - (ucontrol->value.integer.value[0] & 0x3f)) | 0x40;
        spin_lock_irq(&trident->reg_lock);
        change = val != mix->pan;
        mix->pan = val;
        if (mix->voice != NULL)
                snd_trident_write_pan_reg(trident, mix->voice, val);
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_pcm_pan_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         "PCM Pan Playback Control",
        .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
        .count =        32,
        .info =         snd_trident_pcm_pan_control_info,
        .get =          snd_trident_pcm_pan_control_get,
        .put =          snd_trident_pcm_pan_control_put,
};

/*---------------------------------------------------------------------------
    snd_trident_pcm_rvol_control

    Description: PCM reverb volume control
  ---------------------------------------------------------------------------*/

static int snd_trident_pcm_rvol_control_info(struct snd_kcontrol *kcontrol,
                                             struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 127;
        return 0;
}

static int snd_trident_pcm_rvol_control_get(struct snd_kcontrol *kcontrol,
                                            struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];

        ucontrol->value.integer.value[0] = 127 - mix->rvol;
        return 0;
}

static int snd_trident_pcm_rvol_control_put(struct snd_kcontrol *kcontrol,
                                            struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];
        unsigned short val;
        int change = 0;

        val = 0x7f - (ucontrol->value.integer.value[0] & 0x7f);
        spin_lock_irq(&trident->reg_lock);
        change = val != mix->rvol;
        mix->rvol = val;
        if (mix->voice != NULL)
                snd_trident_write_rvol_reg(trident, mix->voice, val);
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static const DECLARE_TLV_DB_SCALE(db_scale_crvol, -3175, 25, 1);

static struct snd_kcontrol_new snd_trident_pcm_rvol_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         "PCM Reverb Playback Volume",
        .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
        .count =        32,
        .info =         snd_trident_pcm_rvol_control_info,
        .get =          snd_trident_pcm_rvol_control_get,
        .put =          snd_trident_pcm_rvol_control_put,
        .tlv = { .p = db_scale_crvol },
};

/*---------------------------------------------------------------------------
    snd_trident_pcm_cvol_control

    Description: PCM chorus volume control
  ---------------------------------------------------------------------------*/

static int snd_trident_pcm_cvol_control_info(struct snd_kcontrol *kcontrol,
                                             struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 127;
        return 0;
}

static int snd_trident_pcm_cvol_control_get(struct snd_kcontrol *kcontrol,
                                            struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];

        ucontrol->value.integer.value[0] = 127 - mix->cvol;
        return 0;
}

static int snd_trident_pcm_cvol_control_put(struct snd_kcontrol *kcontrol,
                                            struct snd_ctl_elem_value *ucontrol)
{
        struct snd_trident *trident = snd_kcontrol_chip(kcontrol);
        struct snd_trident_pcm_mixer *mix = &trident->pcm_mixer[snd_ctl_get_ioffnum(kcontrol, &ucontrol->id)];
        unsigned short val;
        int change = 0;

        val = 0x7f - (ucontrol->value.integer.value[0] & 0x7f);
        spin_lock_irq(&trident->reg_lock);
        change = val != mix->cvol;
        mix->cvol = val;
        if (mix->voice != NULL)
                snd_trident_write_cvol_reg(trident, mix->voice, val);
        spin_unlock_irq(&trident->reg_lock);
        return change;
}

static struct snd_kcontrol_new snd_trident_pcm_cvol_control __devinitdata =
{
        .iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
        .name =         "PCM Chorus Playback Volume",
        .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_INACTIVE,
        .count =        32,
        .info =         snd_trident_pcm_cvol_control_info,
        .get =          snd_trident_pcm_cvol_control_get,
        .put =          snd_trident_pcm_cvol_control_put,
        .tlv = { .p = db_scale_crvol },
};

static void snd_trident_notify_pcm_change1(struct snd_card *card,
                                           struct snd_kcontrol *kctl,
                                           int num, int activate)
{
        struct snd_ctl_elem_id id;

        if (! kctl)
                return;
        if (activate)
                kctl->vd[num].access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        else
                kctl->vd[num].access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE |
                       SNDRV_CTL_EVENT_MASK_INFO,
                       snd_ctl_build_ioff(&id, kctl, num));
}

static void snd_trident_notify_pcm_change(struct snd_trident *trident,
                                          struct snd_trident_pcm_mixer *tmix,
                                          int num, int activate)
{
        snd_trident_notify_pcm_change1(trident->card, trident->ctl_vol, num, activate);
        snd_trident_notify_pcm_change1(trident->card, trident->ctl_pan, num, activate);
        snd_trident_notify_pcm_change1(trident->card, trident->ctl_rvol, num, activate);
        snd_trident_notify_pcm_change1(trident->card, trident->ctl_cvol, num, activate);
}

static int snd_trident_pcm_mixer_build(struct snd_trident *trident,
                                       struct snd_trident_voice *voice,
                                       struct snd_pcm_substream *substream)
{
        struct snd_trident_pcm_mixer *tmix;

        if (snd_BUG_ON(!trident || !voice || !substream))
                return -EINVAL;
        tmix = &trident->pcm_mixer[substream->number];
        tmix->voice = voice;
        tmix->vol = T4D_DEFAULT_PCM_VOL;
        tmix->pan = T4D_DEFAULT_PCM_PAN;
        tmix->rvol = T4D_DEFAULT_PCM_RVOL;
        tmix->cvol = T4D_DEFAULT_PCM_CVOL;
        snd_trident_notify_pcm_change(trident, tmix, substream->number, 1);
        return 0;
}

static int snd_trident_pcm_mixer_free(struct snd_trident *trident, struct snd_trident_voice *voice, struct snd_pcm_substream *substream)
{
        struct snd_trident_pcm_mixer *tmix;

        if (snd_BUG_ON(!trident || !substream))
                return -EINVAL;
        tmix = &trident->pcm_mixer[substream->number];
        tmix->voice = NULL;
        snd_trident_notify_pcm_change(trident, tmix, substream->number, 0);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_mixer
  
   Description: This routine registers the 4DWave device for mixer support.
                
   Parameters:  trident - pointer to target device class for 4DWave.

   Returns:     None
  
  ---------------------------------------------------------------------------*/

static int __devinit snd_trident_mixer(struct snd_trident * trident, int pcm_spdif_device)
{
        struct snd_ac97_template _ac97;
        struct snd_card *card = trident->card;
        struct snd_kcontrol *kctl;
        struct snd_ctl_elem_value *uctl;
        int idx, err, retries = 2;
        static struct snd_ac97_bus_ops ops = {
                .write = snd_trident_codec_write,
                .read = snd_trident_codec_read,
        };

        uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
        if (!uctl)
                return -ENOMEM;

        if ((err = snd_ac97_bus(trident->card, 0, &ops, NULL, &trident->ac97_bus)) < 0)
                goto __out;

        memset(&_ac97, 0, sizeof(_ac97));
        _ac97.private_data = trident;
        trident->ac97_detect = 1;

      __again:
        if ((err = snd_ac97_mixer(trident->ac97_bus, &_ac97, &trident->ac97)) < 0) {
                if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                        if ((err = snd_trident_sis_reset(trident)) < 0)
                                goto __out;
                        if (retries-- > 0)
                                goto __again;
                        err = -EIO;
                }
                goto __out;
        }
        
        /* secondary codec? */
        if (trident->device == TRIDENT_DEVICE_ID_SI7018 &&
            (inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL)) & SI_AC97_PRIMARY_READY) != 0) {
                _ac97.num = 1;
                err = snd_ac97_mixer(trident->ac97_bus, &_ac97, &trident->ac97_sec);
                if (err < 0)
                        snd_printk(KERN_ERR "SI7018: the secondary codec - invalid access\n");
#if 0   // only for my testing purpose --jk
                {
                        struct snd_ac97 *mc97;
                        err = snd_ac97_modem(trident->card, &_ac97, &mc97);
                        if (err < 0)
                                snd_printk(KERN_ERR "snd_ac97_modem returned error %i\n", err);
                }
#endif
        }
        
        trident->ac97_detect = 0;

        if (trident->device != TRIDENT_DEVICE_ID_SI7018) {
                if ((err = snd_ctl_add(card, kctl = snd_ctl_new1(&snd_trident_vol_wave_control, trident))) < 0)
                        goto __out;
                kctl->put(kctl, uctl);
                if ((err = snd_ctl_add(card, kctl = snd_ctl_new1(&snd_trident_vol_music_control, trident))) < 0)
                        goto __out;
                kctl->put(kctl, uctl);
                outl(trident->musicvol_wavevol = 0x00000000, TRID_REG(trident, T4D_MUSICVOL_WAVEVOL));
        } else {
                outl(trident->musicvol_wavevol = 0xffff0000, TRID_REG(trident, T4D_MUSICVOL_WAVEVOL));
        }

        for (idx = 0; idx < 32; idx++) {
                struct snd_trident_pcm_mixer *tmix;
                
                tmix = &trident->pcm_mixer[idx];
                tmix->voice = NULL;
        }
        if ((trident->ctl_vol = snd_ctl_new1(&snd_trident_pcm_vol_control, trident)) == NULL)
                goto __nomem;
        if ((err = snd_ctl_add(card, trident->ctl_vol)))
                goto __out;
                
        if ((trident->ctl_pan = snd_ctl_new1(&snd_trident_pcm_pan_control, trident)) == NULL)
                goto __nomem;
        if ((err = snd_ctl_add(card, trident->ctl_pan)))
                goto __out;

        if ((trident->ctl_rvol = snd_ctl_new1(&snd_trident_pcm_rvol_control, trident)) == NULL)
                goto __nomem;
        if ((err = snd_ctl_add(card, trident->ctl_rvol)))
                goto __out;

        if ((trident->ctl_cvol = snd_ctl_new1(&snd_trident_pcm_cvol_control, trident)) == NULL)
                goto __nomem;
        if ((err = snd_ctl_add(card, trident->ctl_cvol)))
                goto __out;

        if (trident->device == TRIDENT_DEVICE_ID_NX) {
                if ((err = snd_ctl_add(card, kctl = snd_ctl_new1(&snd_trident_ac97_rear_control, trident))) < 0)
                        goto __out;
                kctl->put(kctl, uctl);
        }
        if (trident->device == TRIDENT_DEVICE_ID_NX || trident->device == TRIDENT_DEVICE_ID_SI7018) {

                kctl = snd_ctl_new1(&snd_trident_spdif_control, trident);
                if (kctl == NULL) {
                        err = -ENOMEM;
                        goto __out;
                }
                if (trident->ac97->ext_id & AC97_EI_SPDIF)
                        kctl->id.index++;
                if (trident->ac97_sec && (trident->ac97_sec->ext_id & AC97_EI_SPDIF))
                        kctl->id.index++;
                idx = kctl->id.index;
                if ((err = snd_ctl_add(card, kctl)) < 0)
                        goto __out;
                kctl->put(kctl, uctl);

                kctl = snd_ctl_new1(&snd_trident_spdif_default, trident);
                if (kctl == NULL) {
                        err = -ENOMEM;
                        goto __out;
                }
                kctl->id.index = idx;
                kctl->id.device = pcm_spdif_device;
                if ((err = snd_ctl_add(card, kctl)) < 0)
                        goto __out;

                kctl = snd_ctl_new1(&snd_trident_spdif_mask, trident);
                if (kctl == NULL) {
                        err = -ENOMEM;
                        goto __out;
                }
                kctl->id.index = idx;
                kctl->id.device = pcm_spdif_device;
                if ((err = snd_ctl_add(card, kctl)) < 0)
                        goto __out;

                kctl = snd_ctl_new1(&snd_trident_spdif_stream, trident);
                if (kctl == NULL) {
                        err = -ENOMEM;
                        goto __out;
                }
                kctl->id.index = idx;
                kctl->id.device = pcm_spdif_device;
                if ((err = snd_ctl_add(card, kctl)) < 0)
                        goto __out;
                trident->spdif_pcm_ctl = kctl;
        }

        err = 0;
        goto __out;

 __nomem:
        err = -ENOMEM;

 __out:
        kfree(uctl);

        return err;
}

/*
 * gameport interface
 */

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))

static unsigned char snd_trident_gameport_read(struct gameport *gameport)
{
        struct snd_trident *chip = gameport_get_port_data(gameport);

        if (snd_BUG_ON(!chip))
                return 0;
        return inb(TRID_REG(chip, GAMEPORT_LEGACY));
}

static void snd_trident_gameport_trigger(struct gameport *gameport)
{
        struct snd_trident *chip = gameport_get_port_data(gameport);

        if (snd_BUG_ON(!chip))
                return;
        outb(0xff, TRID_REG(chip, GAMEPORT_LEGACY));
}

static int snd_trident_gameport_cooked_read(struct gameport *gameport, int *axes, int *buttons)
{
        struct snd_trident *chip = gameport_get_port_data(gameport);
        int i;

        if (snd_BUG_ON(!chip))
                return 0;

        *buttons = (~inb(TRID_REG(chip, GAMEPORT_LEGACY)) >> 4) & 0xf;

        for (i = 0; i < 4; i++) {
                axes[i] = inw(TRID_REG(chip, GAMEPORT_AXES + i * 2));
                if (axes[i] == 0xffff) axes[i] = -1;
        }
        
        return 0;
}

static int snd_trident_gameport_open(struct gameport *gameport, int mode)
{
        struct snd_trident *chip = gameport_get_port_data(gameport);

        if (snd_BUG_ON(!chip))
                return 0;

        switch (mode) {
                case GAMEPORT_MODE_COOKED:
                        outb(GAMEPORT_MODE_ADC, TRID_REG(chip, GAMEPORT_GCR));
                        msleep(20);
                        return 0;
                case GAMEPORT_MODE_RAW:
                        outb(0, TRID_REG(chip, GAMEPORT_GCR));
                        return 0;
                default:
                        return -1;
        }
}

int __devinit snd_trident_create_gameport(struct snd_trident *chip)
{
        struct gameport *gp;

        chip->gameport = gp = gameport_allocate_port();
        if (!gp) {
                printk(KERN_ERR "trident: cannot allocate memory for gameport\n");
                return -ENOMEM;
        }

        gameport_set_name(gp, "Trident 4DWave");
        gameport_set_phys(gp, "pci%s/gameport0", pci_name(chip->pci));
        gameport_set_dev_parent(gp, &chip->pci->dev);

        gameport_set_port_data(gp, chip);
        gp->fuzz = 64;
        gp->read = snd_trident_gameport_read;
        gp->trigger = snd_trident_gameport_trigger;
        gp->cooked_read = snd_trident_gameport_cooked_read;
        gp->open = snd_trident_gameport_open;

        gameport_register_port(gp);

        return 0;
}

static inline void snd_trident_free_gameport(struct snd_trident *chip)
{
        if (chip->gameport) {
                gameport_unregister_port(chip->gameport);
                chip->gameport = NULL;
        }
}
#else
int __devinit snd_trident_create_gameport(struct snd_trident *chip) { return -ENOSYS; }
static inline void snd_trident_free_gameport(struct snd_trident *chip) { }
#endif /* CONFIG_GAMEPORT */

/*
 * delay for 1 tick
 */
static inline void do_delay(struct snd_trident *chip)
{
        schedule_timeout_uninterruptible(1);
}

/*
 *  SiS reset routine
 */

static int snd_trident_sis_reset(struct snd_trident *trident)
{
        unsigned long end_time;
        unsigned int i;
        int r;

        r = trident->in_suspend ? 0 : 2;        /* count of retries */
      __si7018_retry:
        pci_write_config_byte(trident->pci, 0x46, 0x04);        /* SOFTWARE RESET */
        udelay(100);
        pci_write_config_byte(trident->pci, 0x46, 0x00);
        udelay(100);
        /* disable AC97 GPIO interrupt */
        outb(0x00, TRID_REG(trident, SI_AC97_GPIO));
        /* initialize serial interface, force cold reset */
        i = PCMOUT|SURROUT|CENTEROUT|LFEOUT|SECONDARY_ID|COLD_RESET;
        outl(i, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
        udelay(1000);
        /* remove cold reset */
        i &= ~COLD_RESET;
        outl(i, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
        udelay(2000);
        /* wait, until the codec is ready */
        end_time = (jiffies + (HZ * 3) / 4) + 1;
        do {
                if ((inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL)) & SI_AC97_PRIMARY_READY) != 0)
                        goto __si7018_ok;
                do_delay(trident);
        } while (time_after_eq(end_time, jiffies));
        snd_printk(KERN_ERR "AC'97 codec ready error [0x%x]\n", inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL)));
        if (r-- > 0) {
                end_time = jiffies + HZ;
                do {
                        do_delay(trident);
                } while (time_after_eq(end_time, jiffies));
                goto __si7018_retry;
        }
      __si7018_ok:
        /* wait for the second codec */
        do {
                if ((inl(TRID_REG(trident, SI_SERIAL_INTF_CTRL)) & SI_AC97_SECONDARY_READY) != 0)
                        break;
                do_delay(trident);
        } while (time_after_eq(end_time, jiffies));
        /* enable 64 channel mode */
        outl(BANK_B_EN, TRID_REG(trident, T4D_LFO_GC_CIR));
        return 0;
}

/*  
 *  /proc interface
 */

static void snd_trident_proc_read(struct snd_info_entry *entry, 
                                  struct snd_info_buffer *buffer)
{
        struct snd_trident *trident = entry->private_data;
        char *s;

        switch (trident->device) {
        case TRIDENT_DEVICE_ID_SI7018:
                s = "SiS 7018 Audio";
                break;
        case TRIDENT_DEVICE_ID_DX:
                s = "Trident 4DWave PCI DX";
                break;
        case TRIDENT_DEVICE_ID_NX:
                s = "Trident 4DWave PCI NX";
                break;
        default:
                s = "???";
        }
        snd_iprintf(buffer, "%s\n\n", s);
        snd_iprintf(buffer, "Spurious IRQs    : %d\n", trident->spurious_irq_count);
        snd_iprintf(buffer, "Spurious IRQ dlta: %d\n", trident->spurious_irq_max_delta);
        if (trident->device == TRIDENT_DEVICE_ID_NX || trident->device == TRIDENT_DEVICE_ID_SI7018)
                snd_iprintf(buffer, "IEC958 Mixer Out : %s\n", trident->spdif_ctrl == 0x28 ? "on" : "off");
        if (trident->device == TRIDENT_DEVICE_ID_NX) {
                snd_iprintf(buffer, "Rear Speakers    : %s\n", trident->ac97_ctrl & 0x00000010 ? "on" : "off");
                if (trident->tlb.entries) {
                        snd_iprintf(buffer,"\nVirtual Memory\n");
                        snd_iprintf(buffer, "Memory Maximum : %d\n", trident->tlb.memhdr->size);
                        snd_iprintf(buffer, "Memory Used    : %d\n", trident->tlb.memhdr->used);
                        snd_iprintf(buffer, "Memory Free    : %d\n", snd_util_mem_avail(trident->tlb.memhdr));
                }
        }
}

static void __devinit snd_trident_proc_init(struct snd_trident * trident)
{
        struct snd_info_entry *entry;
        const char *s = "trident";
        
        if (trident->device == TRIDENT_DEVICE_ID_SI7018)
                s = "sis7018";
        if (! snd_card_proc_new(trident->card, s, &entry))
                snd_info_set_text_ops(entry, trident, snd_trident_proc_read);
}

static int snd_trident_dev_free(struct snd_device *device)
{
        struct snd_trident *trident = device->device_data;
        return snd_trident_free(trident);
}

/*---------------------------------------------------------------------------
   snd_trident_tlb_alloc
  
   Description: Allocate and set up the TLB page table on 4D NX.
                Each entry has 4 bytes (physical PCI address).
                
   Parameters:  trident - pointer to target device class for 4DWave.

   Returns:     0 or negative error code
  
  ---------------------------------------------------------------------------*/

static int __devinit snd_trident_tlb_alloc(struct snd_trident *trident)
{
        int i;

        /* TLB array must be aligned to 16kB !!! so we allocate
           32kB region and correct offset when necessary */

        if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(trident->pci),
                                2 * SNDRV_TRIDENT_MAX_PAGES * 4, &trident->tlb.buffer) < 0) {
                snd_printk(KERN_ERR "trident: unable to allocate TLB buffer\n");
                return -ENOMEM;
        }
        trident->tlb.entries = (unsigned int*)ALIGN((unsigned long)trident->tlb.buffer.area, SNDRV_TRIDENT_MAX_PAGES * 4);
        trident->tlb.entries_dmaaddr = ALIGN(trident->tlb.buffer.addr, SNDRV_TRIDENT_MAX_PAGES * 4);
        /* allocate shadow TLB page table (virtual addresses) */
        trident->tlb.shadow_entries = vmalloc(SNDRV_TRIDENT_MAX_PAGES*sizeof(unsigned long));
        if (trident->tlb.shadow_entries == NULL) {
                snd_printk(KERN_ERR "trident: unable to allocate shadow TLB entries\n");
                return -ENOMEM;
        }
        /* allocate and setup silent page and initialise TLB entries */
        if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(trident->pci),
                                SNDRV_TRIDENT_PAGE_SIZE, &trident->tlb.silent_page) < 0) {
                snd_printk(KERN_ERR "trident: unable to allocate silent page\n");
                return -ENOMEM;
        }
        memset(trident->tlb.silent_page.area, 0, SNDRV_TRIDENT_PAGE_SIZE);
        for (i = 0; i < SNDRV_TRIDENT_MAX_PAGES; i++) {
                trident->tlb.entries[i] = cpu_to_le32(trident->tlb.silent_page.addr & ~(SNDRV_TRIDENT_PAGE_SIZE-1));
                trident->tlb.shadow_entries[i] = (unsigned long)trident->tlb.silent_page.area;
        }

        /* use emu memory block manager code to manage tlb page allocation */
        trident->tlb.memhdr = snd_util_memhdr_new(SNDRV_TRIDENT_PAGE_SIZE * SNDRV_TRIDENT_MAX_PAGES);
        if (trident->tlb.memhdr == NULL)
                return -ENOMEM;

        trident->tlb.memhdr->block_extra_size = sizeof(struct snd_trident_memblk_arg);
        return 0;
}

/*
 * initialize 4D DX chip
 */

static void snd_trident_stop_all_voices(struct snd_trident *trident)
{
        outl(0xffffffff, TRID_REG(trident, T4D_STOP_A));
        outl(0xffffffff, TRID_REG(trident, T4D_STOP_B));
        outl(0, TRID_REG(trident, T4D_AINTEN_A));
        outl(0, TRID_REG(trident, T4D_AINTEN_B));
}

static int snd_trident_4d_dx_init(struct snd_trident *trident)
{
        struct pci_dev *pci = trident->pci;
        unsigned long end_time;

        /* reset the legacy configuration and whole audio/wavetable block */
        pci_write_config_dword(pci, 0x40, 0);   /* DDMA */
        pci_write_config_byte(pci, 0x44, 0);    /* ports */
        pci_write_config_byte(pci, 0x45, 0);    /* Legacy DMA */
        pci_write_config_byte(pci, 0x46, 4); /* reset */
        udelay(100);
        pci_write_config_byte(pci, 0x46, 0); /* release reset */
        udelay(100);
        
        /* warm reset of the AC'97 codec */
        outl(0x00000001, TRID_REG(trident, DX_ACR2_AC97_COM_STAT));
        udelay(100);
        outl(0x00000000, TRID_REG(trident, DX_ACR2_AC97_COM_STAT));
        /* DAC on, disable SB IRQ and try to force ADC valid signal */
        trident->ac97_ctrl = 0x0000004a;
        outl(trident->ac97_ctrl, TRID_REG(trident, DX_ACR2_AC97_COM_STAT));
        /* wait, until the codec is ready */
        end_time = (jiffies + (HZ * 3) / 4) + 1;
        do {
                if ((inl(TRID_REG(trident, DX_ACR2_AC97_COM_STAT)) & 0x0010) != 0)
                        goto __dx_ok;
                do_delay(trident);
        } while (time_after_eq(end_time, jiffies));
        snd_printk(KERN_ERR "AC'97 codec ready error\n");
        return -EIO;

 __dx_ok:
        snd_trident_stop_all_voices(trident);

        return 0;
}

/*
 * initialize 4D NX chip
 */
static int snd_trident_4d_nx_init(struct snd_trident *trident)
{
        struct pci_dev *pci = trident->pci;
        unsigned long end_time;

        /* reset the legacy configuration and whole audio/wavetable block */
        pci_write_config_dword(pci, 0x40, 0);   /* DDMA */
        pci_write_config_byte(pci, 0x44, 0);    /* ports */
        pci_write_config_byte(pci, 0x45, 0);    /* Legacy DMA */

        pci_write_config_byte(pci, 0x46, 1); /* reset */
        udelay(100);
        pci_write_config_byte(pci, 0x46, 0); /* release reset */
        udelay(100);

        /* warm reset of the AC'97 codec */
        outl(0x00000001, TRID_REG(trident, NX_ACR0_AC97_COM_STAT));
        udelay(100);
        outl(0x00000000, TRID_REG(trident, NX_ACR0_AC97_COM_STAT));
        /* wait, until the codec is ready */
        end_time = (jiffies + (HZ * 3) / 4) + 1;
        do {
                if ((inl(TRID_REG(trident, NX_ACR0_AC97_COM_STAT)) & 0x0008) != 0)
                        goto __nx_ok;
                do_delay(trident);
        } while (time_after_eq(end_time, jiffies));
        snd_printk(KERN_ERR "AC'97 codec ready error [0x%x]\n", inl(TRID_REG(trident, NX_ACR0_AC97_COM_STAT)));
        return -EIO;

 __nx_ok:
        /* DAC on */
        trident->ac97_ctrl = 0x00000002;
        outl(trident->ac97_ctrl, TRID_REG(trident, NX_ACR0_AC97_COM_STAT));
        /* disable SB IRQ */
        outl(NX_SB_IRQ_DISABLE, TRID_REG(trident, T4D_MISCINT));

        snd_trident_stop_all_voices(trident);

        if (trident->tlb.entries != NULL) {
                unsigned int i;
                /* enable virtual addressing via TLB */
                i = trident->tlb.entries_dmaaddr;
                i |= 0x00000001;
                outl(i, TRID_REG(trident, NX_TLBC));
        } else {
                outl(0, TRID_REG(trident, NX_TLBC));
        }
        /* initialize S/PDIF */
        outl(trident->spdif_bits, TRID_REG(trident, NX_SPCSTATUS));
        outb(trident->spdif_ctrl, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));

        return 0;
}

/*
 * initialize sis7018 chip
 */
static int snd_trident_sis_init(struct snd_trident *trident)
{
        int err;

        if ((err = snd_trident_sis_reset(trident)) < 0)
                return err;

        snd_trident_stop_all_voices(trident);

        /* initialize S/PDIF */
        outl(trident->spdif_bits, TRID_REG(trident, SI_SPDIF_CS));

        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_create
  
   Description: This routine will create the device specific class for
                the 4DWave card. It will also perform basic initialization.
                
   Parameters:  card  - which card to create
                pci   - interface to PCI bus resource info
                dma1ptr - playback dma buffer
                dma2ptr - capture dma buffer
                irqptr  -  interrupt resource info

   Returns:     4DWave device class private data
  
  ---------------------------------------------------------------------------*/

int __devinit snd_trident_create(struct snd_card *card,
                       struct pci_dev *pci,
                       int pcm_streams,
                       int pcm_spdif_device,
                       int max_wavetable_size,
                       struct snd_trident ** rtrident)
{
        struct snd_trident *trident;
        int i, err;
        struct snd_trident_voice *voice;
        struct snd_trident_pcm_mixer *tmix;
        static struct snd_device_ops ops = {
                .dev_free =     snd_trident_dev_free,
        };

        *rtrident = NULL;

        /* enable PCI device */
        if ((err = pci_enable_device(pci)) < 0)
                return err;
        /* check, if we can restrict PCI DMA transfers to 30 bits */
        if (pci_set_dma_mask(pci, DMA_30BIT_MASK) < 0 ||
            pci_set_consistent_dma_mask(pci, DMA_30BIT_MASK) < 0) {
                snd_printk(KERN_ERR "architecture does not support 30bit PCI busmaster DMA\n");
                pci_disable_device(pci);
                return -ENXIO;
        }
        
        trident = kzalloc(sizeof(*trident), GFP_KERNEL);
        if (trident == NULL) {
                pci_disable_device(pci);
                return -ENOMEM;
        }
        trident->device = (pci->vendor << 16) | pci->device;
        trident->card = card;
        trident->pci = pci;
        spin_lock_init(&trident->reg_lock);
        spin_lock_init(&trident->event_lock);
        spin_lock_init(&trident->voice_alloc);
        if (pcm_streams < 1)
                pcm_streams = 1;
        if (pcm_streams > 32)
                pcm_streams = 32;
        trident->ChanPCM = pcm_streams;
        if (max_wavetable_size < 0 )
                max_wavetable_size = 0;
        trident->synth.max_size = max_wavetable_size * 1024;
        trident->irq = -1;

        trident->midi_port = TRID_REG(trident, T4D_MPU401_BASE);
        pci_set_master(pci);

        if ((err = pci_request_regions(pci, "Trident Audio")) < 0) {
                kfree(trident);
                pci_disable_device(pci);
                return err;
        }
        trident->port = pci_resource_start(pci, 0);

        if (request_irq(pci->irq, snd_trident_interrupt, IRQF_SHARED,
                        "Trident Audio", trident)) {
                snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
                snd_trident_free(trident);
                return -EBUSY;
        }
        trident->irq = pci->irq;

        /* allocate 16k-aligned TLB for NX cards */
        trident->tlb.entries = NULL;
        trident->tlb.buffer.area = NULL;
        if (trident->device == TRIDENT_DEVICE_ID_NX) {
                if ((err = snd_trident_tlb_alloc(trident)) < 0) {
                        snd_trident_free(trident);
                        return err;
                }
        }

        trident->spdif_bits = trident->spdif_pcm_bits = SNDRV_PCM_DEFAULT_CON_SPDIF;

        /* initialize chip */
        switch (trident->device) {
        case TRIDENT_DEVICE_ID_DX:
                err = snd_trident_4d_dx_init(trident);
                break;
        case TRIDENT_DEVICE_ID_NX:
                err = snd_trident_4d_nx_init(trident);
                break;
        case TRIDENT_DEVICE_ID_SI7018:
                err = snd_trident_sis_init(trident);
                break;
        default:
                snd_BUG();
                break;
        }
        if (err < 0) {
                snd_trident_free(trident);
                return err;
        }

        if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, trident, &ops)) < 0) {
                snd_trident_free(trident);
                return err;
        }

        if ((err = snd_trident_mixer(trident, pcm_spdif_device)) < 0)
                return err;
        
        /* initialise synth voices */
        for (i = 0; i < 64; i++) {
                voice = &trident->synth.voices[i];
                voice->number = i;
                voice->trident = trident;
        }
        /* initialize pcm mixer entries */
        for (i = 0; i < 32; i++) {
                tmix = &trident->pcm_mixer[i];
                tmix->vol = T4D_DEFAULT_PCM_VOL;
                tmix->pan = T4D_DEFAULT_PCM_PAN;
                tmix->rvol = T4D_DEFAULT_PCM_RVOL;
                tmix->cvol = T4D_DEFAULT_PCM_CVOL;
        }

        snd_trident_enable_eso(trident);

        snd_trident_proc_init(trident);
        snd_card_set_dev(card, &pci->dev);
        *rtrident = trident;
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_free
  
   Description: This routine will free the device specific class for
                the 4DWave card. 
                
   Parameters:  trident  - device specific private data for 4DWave card

   Returns:     None.
  
  ---------------------------------------------------------------------------*/

static int snd_trident_free(struct snd_trident *trident)
{
        snd_trident_free_gameport(trident);
        snd_trident_disable_eso(trident);
        // Disable S/PDIF out
        if (trident->device == TRIDENT_DEVICE_ID_NX)
                outb(0x00, TRID_REG(trident, NX_SPCTRL_SPCSO + 3));
        else if (trident->device == TRIDENT_DEVICE_ID_SI7018) {
                outl(0, TRID_REG(trident, SI_SERIAL_INTF_CTRL));
        }
        if (trident->irq >= 0)
                free_irq(trident->irq, trident);
        if (trident->tlb.buffer.area) {
                outl(0, TRID_REG(trident, NX_TLBC));
                if (trident->tlb.memhdr)
                        snd_util_memhdr_free(trident->tlb.memhdr);
                if (trident->tlb.silent_page.area)
                        snd_dma_free_pages(&trident->tlb.silent_page);
                vfree(trident->tlb.shadow_entries);
                snd_dma_free_pages(&trident->tlb.buffer);
        }
        pci_release_regions(trident->pci);
        pci_disable_device(trident->pci);
        kfree(trident);
        return 0;
}

/*---------------------------------------------------------------------------
   snd_trident_interrupt
  
   Description: ISR for Trident 4DWave device
                
   Parameters:  trident  - device specific private data for 4DWave card

   Problems:    It seems that Trident chips generates interrupts more than
                one time in special cases. The spurious interrupts are
                detected via sample timer (T4D_STIMER) and computing
                corresponding delta value. The limits are detected with
                the method try & fail so it is possible that it won't
                work on all computers. [jaroslav]

   Returns:     None.
  
  ---------------------------------------------------------------------------*/

static irqreturn_t snd_trident_interrupt(int irq, void *dev_id)
{
        struct snd_trident *trident = dev_id;
        unsigned int audio_int, chn_int, stimer, channel, mask, tmp;
        int delta;
        struct snd_trident_voice *voice;

        audio_int = inl(TRID_REG(trident, T4D_MISCINT));
        if ((audio_int & (ADDRESS_IRQ|MPU401_IRQ)) == 0)
                return IRQ_NONE;
        if (audio_int & ADDRESS_IRQ) {
                // get interrupt status for all channels
                spin_lock(&trident->reg_lock);
                stimer = inl(TRID_REG(trident, T4D_STIMER)) & 0x00ffffff;
                chn_int = inl(TRID_REG(trident, T4D_AINT_A));
                if (chn_int == 0)
                        goto __skip1;
                outl(chn_int, TRID_REG(trident, T4D_AINT_A));   /* ack */
              __skip1:
                chn_int = inl(TRID_REG(trident, T4D_AINT_B));
                if (chn_int == 0)
                        goto __skip2;
                for (channel = 63; channel >= 32; channel--) {
                        mask = 1 << (channel&0x1f);
                        if ((chn_int & mask) == 0)
                                continue;
                        voice = &trident->synth.voices[channel];
                        if (!voice->pcm || voice->substream == NULL) {
                                outl(mask, TRID_REG(trident, T4D_STOP_B));
                                continue;
                        }
                        delta = (int)stimer - (int)voice->stimer;
                        if (delta < 0)
                                delta = -delta;
                        if ((unsigned int)delta < voice->spurious_threshold) {
                                /* do some statistics here */
                                trident->spurious_irq_count++;
                                if (trident->spurious_irq_max_delta < (unsigned int)delta)
                                        trident->spurious_irq_max_delta = delta;
                                continue;
                        }
                        voice->stimer = stimer;
                        if (voice->isync) {
                                if (!voice->isync3) {
                                        tmp = inw(TRID_REG(trident, T4D_SBBL_SBCL));
                                        if (trident->bDMAStart & 0x40)
                                                tmp >>= 1;
                                        if (tmp > 0)
                                                tmp = voice->isync_max - tmp;
                                } else {
                                        tmp = inl(TRID_REG(trident, NX_SPCTRL_SPCSO)) & 0x00ffffff;
                                }
                                if (tmp < voice->isync_mark) {
                                        if (tmp > 0x10)
                                                tmp = voice->isync_ESO - 7;
                                        else
                                                tmp = voice->isync_ESO + 2;
                                        /* update ESO for IRQ voice to preserve sync */
                                        snd_trident_stop_voice(trident, voice->number);
                                        snd_trident_write_eso_reg(trident, voice, tmp);
                                        snd_trident_start_voice(trident, voice->number);
                                }
                        } else if (voice->isync2) {
                                voice->isync2 = 0;
                                /* write original ESO and update CSO for IRQ voice to preserve sync */
                                snd_trident_stop_voice(trident, voice->number);
                                snd_trident_write_cso_reg(trident, voice, voice->isync_mark);
                                snd_trident_write_eso_reg(trident, voice, voice->ESO);
                                snd_trident_start_voice(trident, voice->number);
                        }
#if 0
                        if (voice->extra) {
                                /* update CSO for extra voice to preserve sync */
                                snd_trident_stop_voice(trident, voice->extra->number);
                                snd_trident_write_cso_reg(trident, voice->extra, 0);
                                snd_trident_start_voice(trident, voice->extra->number);
                        }
#endif
                        spin_unlock(&trident->reg_lock);
                        snd_pcm_period_elapsed(voice->substream);
                        spin_lock(&trident->reg_lock);
                }
                outl(chn_int, TRID_REG(trident, T4D_AINT_B));   /* ack */
              __skip2:
                spin_unlock(&trident->reg_lock);
        }
        if (audio_int & MPU401_IRQ) {
                if (trident->rmidi) {
                        snd_mpu401_uart_interrupt(irq, trident->rmidi->private_data);
                } else {
                        inb(TRID_REG(trident, T4D_MPUR0));
                }
        }
        // outl((ST_TARGET_REACHED | MIXER_OVERFLOW | MIXER_UNDERFLOW), TRID_REG(trident, T4D_MISCINT));
        return IRQ_HANDLED;
}

struct snd_trident_voice *snd_trident_alloc_voice(struct snd_trident * trident, int type, int client, int port)
{
        struct snd_trident_voice *pvoice;
        unsigned long flags;
        int idx;

        spin_lock_irqsave(&trident->voice_alloc, flags);
        if (type == SNDRV_TRIDENT_VOICE_TYPE_PCM) {
                idx = snd_trident_allocate_pcm_channel(trident);
                if(idx < 0) {
                        spin_unlock_irqrestore(&trident->voice_alloc, flags);
                        return NULL;
                }
                pvoice = &trident->synth.voices[idx];
                pvoice->use = 1;
                pvoice->pcm = 1;
                pvoice->capture = 0;
                pvoice->spdif = 0;
                pvoice->memblk = NULL;
                pvoice->substream = NULL;
                spin_unlock_irqrestore(&trident->voice_alloc, flags);
                return pvoice;
        }
        if (type == SNDRV_TRIDENT_VOICE_TYPE_SYNTH) {
                idx = snd_trident_allocate_synth_channel(trident);
                if(idx < 0) {
                        spin_unlock_irqrestore(&trident->voice_alloc, flags);
                        return NULL;
                }
                pvoice = &trident->synth.voices[idx];
                pvoice->use = 1;
                pvoice->synth = 1;
                pvoice->client = client;
                pvoice->port = port;
                pvoice->memblk = NULL;
                spin_unlock_irqrestore(&trident->voice_alloc, flags);
                return pvoice;
        }
        if (type == SNDRV_TRIDENT_VOICE_TYPE_MIDI) {
        }
        spin_unlock_irqrestore(&trident->voice_alloc, flags);
        return NULL;
}

EXPORT_SYMBOL(snd_trident_alloc_voice);

void snd_trident_free_voice(struct snd_trident * trident, struct snd_trident_voice *voice)
{
        unsigned long flags;
        void (*private_free)(struct snd_trident_voice *);
        void *private_data;

        if (voice == NULL || !voice->use)
                return;
        snd_trident_clear_voices(trident, voice->number, voice->number);
        spin_lock_irqsave(&trident->voice_alloc, flags);
        private_free = voice->private_free;
        private_data = voice->private_data;
        voice->private_free = NULL;
        voice->private_data = NULL;
        if (voice->pcm)
                snd_trident_free_pcm_channel(trident, voice->number);
        if (voice->synth)
                snd_trident_free_synth_channel(trident, voice->number);
        voice->use = voice->pcm = voice->synth = voice->midi = 0;
        voice->capture = voice->spdif = 0;
        voice->sample_ops = NULL;
        voice->substream = NULL;
        voice->extra = NULL;
        spin_unlock_irqrestore(&trident->voice_alloc, flags);
        if (private_free)
                private_free(voice);
}

EXPORT_SYMBOL(snd_trident_free_voice);

static void snd_trident_clear_voices(struct snd_trident * trident, unsigned short v_min, unsigned short v_max)
{
        unsigned int i, val, mask[2] = { 0, 0 };

        if (snd_BUG_ON(v_min > 63 || v_max > 63))
                return;
        for (i = v_min; i <= v_max; i++)
                mask[i >> 5] |= 1 << (i & 0x1f);
        if (mask[0]) {
                outl(mask[0], TRID_REG(trident, T4D_STOP_A));
                val = inl(TRID_REG(trident, T4D_AINTEN_A));
                outl(val & ~mask[0], TRID_REG(trident, T4D_AINTEN_A));
        }
        if (mask[1]) {
                outl(mask[1], TRID_REG(trident, T4D_STOP_B));
                val = inl(TRID_REG(trident, T4D_AINTEN_B));
                outl(val & ~mask[1], TRID_REG(trident, T4D_AINTEN_B));
        }
}

#ifdef CONFIG_PM
int snd_trident_suspend(struct pci_dev *pci, pm_message_t state)
{
        struct snd_card *card = pci_get_drvdata(pci);
        struct snd_trident *trident = card->private_data;

        trident->in_suspend = 1;
        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
        snd_pcm_suspend_all(trident->pcm);
        snd_pcm_suspend_all(trident->foldback);
        snd_pcm_suspend_all(trident->spdif);

        snd_ac97_suspend(trident->ac97);
        snd_ac97_suspend(trident->ac97_sec);

        pci_disable_device(pci);
        pci_save_state(pci);
        pci_set_power_state(pci, pci_choose_state(pci, state));
        return 0;
}

int snd_trident_resume(struct pci_dev *pci)
{
        struct snd_card *card = pci_get_drvdata(pci);
        struct snd_trident *trident = card->private_data;

        pci_set_power_state(pci, PCI_D0);
        pci_restore_state(pci);
        if (pci_enable_device(pci) < 0) {
                printk(KERN_ERR "trident: pci_enable_device failed, "
                       "disabling device\n");
                snd_card_disconnect(card);
                return -EIO;
        }
        pci_set_master(pci);

        switch (trident->device) {
        case TRIDENT_DEVICE_ID_DX:
                snd_trident_4d_dx_init(trident);
                break;
        case TRIDENT_DEVICE_ID_NX:
                snd_trident_4d_nx_init(trident);
                break;
        case TRIDENT_DEVICE_ID_SI7018:
                snd_trident_sis_init(trident);
                break;
        }

        snd_ac97_resume(trident->ac97);
        snd_ac97_resume(trident->ac97_sec);

        /* restore some registers */
        outl(trident->musicvol_wavevol, TRID_REG(trident, T4D_MUSICVOL_WAVEVOL));

        snd_trident_enable_eso(trident);

        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
        trident->in_suspend = 0;
        return 0;
}
#endif /* CONFIG_PM */

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